IBM 770 User Manual

05L1739
S05L-1739-00

Note

Before using this information and the product it supports, be sure to read the
general information under Appendix C, “Notices” on page C-1.

First Edition (December 1997)

The following paragraph does not apply to the United Kingdom or any country
where such provisions are inconsistent with local law: INTERNATIONAL

BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION “AS IS”
WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states
do not allow disclaimer of express or implied warranties in certain transactions;
therefore, this statement may not apply to you.

This publication could include technical inaccuracies or typographical errors. Changes
are periodically made to the information herein; these changes will be incorporated in
new editions of the publication. IBM may make improvements or changes in the
products or the programs described in this publication at any time.

Requests for technical information about IBM products should be made to your IBM
Authorized Dealer or your IBM Marketing Representative.

 Copyright International Business Machines Corporation 1997. All rights
reserved.

Note to U.S. Government Users — Documentation related to restricted rights — Use,
duplication or disclosure is subject to restrictions set forth in GSA ADP Schedule
Contract with IBM Corp.

Contents

Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Section 1. System Overview . . . . . . . . . . . . . . . . . . . 1-1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

System Board Devices and Features ............... 1-3

System Board I/O Address Map .................. 1-5

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Performance Specifications . . . . . . . . . . . . . . . . . . . 1-7

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . 1-8

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . 1-9

Acoustical Readings . . . . . . . . . . . . . . . . . . . . . . . 1-9

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Output Protection . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Voltage Sequencing . . . . . . . . . . . . . . . . . . . . . . . 1-11

Power Supply Connector .................... 1-11

Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Section 2. System Board . . . . . . . . . . . . . . . . . . . . . 2-1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Cache Memory Operation .................... 2-2

Cacheable Address Space .................... 2-3

Bus Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Keyboard/Mouse Connector . . . . . . . . . . . . . . . . . . . . . 2-4

Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Scan Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Keyboard ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Displayable Characters and Symbols .............. 2-7

Hard Disk Drive Connector ..................... 2-8

External Bus Connector ....................... 2-9

UltraBay II Connector ....................... 2-12

Diskette Drive and Controller ................... 2-15

Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

ROM Subsystem . . . . . . . . . . . . . . . . . . . . . . . . 2-16

RAM Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

System Memory Map ...................... 2-17

System Board Memory for the DIMM Connectors ..... 2-18

 Copyright IBM Corp. 1997 iii

RT/CMOS RAM . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Miscellaneous System Functions and Ports .......... 2-29

Nonmaskable Interrupt (NMI) ................. 2-29

System Control Port A (Hex 0092) .............. 2-30

System Control Port B (Hex 0061) .............. 2-31

Power-On Password . . . . . . . . . . . . . . . . . . . . . . 2-32

Other Passwords . . . . . . . . . . . . . . . . . . . . . . . . 2-32

Selectable Drive-Startup Sequence .............. 2-33

Hardware Compatibility . . . . . . . . . . . . . . . . . . . . . . 2-34

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

Section 3. Subsystems . . . . . . . . . . . . . . . . . . . . . . 3-1

Video Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Video Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Modem Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

ThinkPad Modem . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

MIDI Port Function ........................ 3-5

Sound Blaster Support Function ................ 3-5

Telephony (Modem) Function .................. 3-6

Audio Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

MIDI Port Function ........................ 3-7

Sound Blaster Support Function ................ 3-7

Audio Port Specifications ..................... 3-8

Infrared (IR) Subsystem ....................... 3-9

IRQ Level and DMA Channel .................. 3-9

Enhanced Video Subsystem ................... 3-10

Video Port Specification .................... 3-10

PCMCIA Subsystem . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

IDE Channel on the UltraBay II .................. 3-14

MIDI/Joystick Port . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

MIDI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Joystick Interface . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Appendix A. System Resources . . . . . . . . . . . . . . . . A-1

Appendix B. System Management API (SMAPI) BIOS

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Header Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

Calling Convention . . . . . . . . . . . . . . . . . . . . . . . . . . B-6

Parameter Structure . . . . . . . . . . . . . . . . . . . . . . . B-6

Calling Convention Pseudo Code ............... B-10

Return Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-11

Function Description . . . . . . . . . . . . . . . . . . . . . . . . B-12

iv

System Information Service .................. B-12

System Configuration Service ................. B-22

Power Management Service .................. B-29

Event Bit Definition ....................... B-34

Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-53

Function Declaration . . . . . . . . . . . . . . . . . . . . . . B-57

Installation Check . . . . . . . . . . . . . . . . . . . . . . . . B-58

BIOS Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-62

Appendix C. Notices . . . . . . . . . . . . . . . . . . . . . . . . C-1

Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-1

v

vi

Figures

1-1. Model and Submodel Bytes ............... 1-2

1-2. System Board Devices and Features .......... 1-3

1-3. System Board I/O Address Map ............. 1-5

1-4. Performance Specifications . . . . . . . . . . . . . . . . 1-7

1-5. Physical Specifications . . . . . . . . . . . . . . . . . . 1-8

1-6. Electrical Specifications . . . . . . . . . . . . . . . . . . 1-9

1-7. Acoustical Readings . . . . . . . . . . . . . . . . . . . . 1-9

1-8. Power Supply Maximum Current ........... 1-10

1-9. Voltage Pin Assignments for the 56W AC Adapter . 1-11

1-10. Lithium-ion Battery Pack Specifications ........ 1-12

2-1. Keyboard and Mouse Signals .............. 2-4

2-2. Keyboard/Mouse Connector Pin Assignments ..... 2-4

2-3. Key Numbers for the 84-Key Keyboard ......... 2-5

2-4. Key Numbers for the 85-Key Keyboard ......... 2-6

2-5. Key Numbers for the External Numeric Keypad .... 2-7

2-6. Hard Disk Drive Connector Pin Assignments ..... 2-8

2-7. 240-Pin External Bus Connector Pin Assignments . 2-11

2-8. UltraBay II Connector Pin Assignments ........ 2-13

2-9. Diskette Drive Read, Write, and Format Capabilities 2-15

2-10. System Memory Map .................. 2-17

2-11. DIMM Adapter Card Memory Connector Pin

Assignments . . . . . . . . . . . . . . . . . . . . . . . 2-18

2-12. RT/CMOS RAM Address Map ............. 2-19

2-13. RT/CMOS Address and NMI Mask Register (Hex

0070) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

2-14. RT/CMOS Data Register (Hex 0071) ......... 2-20

2-15. Real-Time Clock Bytes (Hex 000–00D) ........ 2-22

2-16. Status Register A (Hex 00A) .............. 2-22

2-17. Status Register B (Hex 00B) .............. 2-23

2-18. Status Register C (Hex 00C) .............. 2-24

2-19. Status Register D (Hex 00D) .............. 2-24

2-20. Diagnostic Status Byte (Hex 00E) ........... 2-25

2-21. Diskette Drive Type Byte (Hex 010) .......... 2-26

2-22. Diskette Drive Type Bits 7–4 .............. 2-26

2-23. Hard Disk Type Byte (Hex 011) ............ 2-26

2-24. Hard Disk Drive Type 2 (Bits 7–4) ........... 2-26

2-25. Hard Disk Drive Type 3 (Bits 3–0) ........... 2-26

2-26. Hard Disk Drive Type Byte ............... 2-27

2-27. Equipment Byte . . . . . . . . . . . . . . . . . . . . . 2-27

2-28. Installed Diskette Drive Bits .............. 2-27

2-29. Display Operating Mode Bits .............. 2-27

 Copyright IBM Corp. 1997 vii

2-30. System Control Port A (Hex 0092) .......... 2-30

2-31. System Control Port B (Hex 0061, Write) ...... 2-31

2-32. System Control Port B (Hex 0061, Read) ...... 2-31

2-33. Error Codes . . . . . . . . . . . . . . . . . . . . . . . . 2-35

3-1. BIOS Video VGA Modes ................. 3-3

3-2. Video BIOS Extended Modes—Trident 9397 ...... 3-4

3-3. PCMCIA PC Card Slot Pin Assignments ....... 3-12

viii

Preface

This technical reference contains hardware and software interface
information specific to the IBM ThinkPad 770 computer. This
technical reference is intended for those who develop hardware and
software products for the computer. Users should understand
computer architecture and programming concepts.

This publication consists of the following sections and appendixes:

Section 1, “System Overview,” describes the system, features,
and specifications.

Section 2, “System Board,” describes the system-specific
hardware implementations.

Section 3, “Subsystems,” describes the hardware functions
specific to the ThinkPad 770 computer.

Appendix A, “System Resources,” describes the available
system resources for the computer and docking stations.

Appendix B, “System Management API (SMAPI) BIOS
Overview,” describes the system software interface built into the
system, called the System Management Application Program
Interface (SMAPI) BIOS, which controls the system information,
system configuration, and power management features of the
ThinkPad computer.

Appendix C, “Notices,” contains special notices and trademark
information.

An index is also included.

Attention

The term
should not be changed. Use of reserved areas can cause
compatibility problems, loss of data, or permanent damage to the
hardware. When the contents of a register are changed, the state of
the reserved bits must be preserved. Read the register first and
change only the bits that must be changed.

 Copyright IBM Corp. 1997 ix

Reserved

describes certain signals, bits, and registers that

x Preface

Section 1. System Overview

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

System Board Devices and Features ............... 1-3

System Board I/O Address Map .................. 1-5

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Performance Specifications . . . . . . . . . . . . . . . . . . . 1-7

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . 1-8

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . 1-9

Acoustical Readings . . . . . . . . . . . . . . . . . . . . . . . 1-9

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Output Protection . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Voltage Sequencing . . . . . . . . . . . . . . . . . . . . . . . 1-11

Power Supply Connector .................... 1-11

Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

 Copyright IBM Corp. 1997 1-1

Description

The IBM ThinkPad 770 computer (hereafter called the

computer

or the

computer

) is notebook-size computer that feature

ThinkPad

the AT bus architecture. Each computer supports one UltraBay II
and one internal hard disk drive. The ThinkPad 770 computer also
supports an internal CD-ROM drive or an internal DVD drive as an
option.

Programs can distinguish the foregoing computer model from other
ThinkPad models by reading the system ID:

 Interrupt 15H

 Function code (AH)=23H and (AL)=10H.
 Returns
(AL)=27H

The system microprocessor contains an internal cache and cache
controller.

Figure 1-1 lists the model bytes, submodel bytes, and system clock
speed of the system board for each model.

Model Model Byte

(Hex)

770 FC 01 33 MHz

Figure 1-1. Model and Submodel Bytes

Submodel Byte
(Hex)

System Clock

For a listing of the other systems, refer to the

IBM Personal

System/2 and Personal Computer BIOS Interface

1-2 System Overview

.

System Board Devices and Features

Figure 1-2 lists the system board devices and their features. The

IBM Personal System/2 Hardware Interface Technical Reference

describes devices common to PS/2 products by type number.

Device Type Features
Microprocessor – Intel Pentium processor with the MMX

External cache – 512 KB (write back)
System timers 1 Channel 0: system timer

ROM subsystem – 128 KB by 4 banks (1 KB equals 1024 bytes)
RAM subsystem – 32 to 256 MB (1 MB equals 1,048,576 bytes)
CMOS RAM

subsystem
EEPROM

subsystem
Video subsystem – XGA video functions:

– 128 bytes CMOS RAM with real-time

– 1 K bits

technology

 200 or 233 MHz
 32 KB on-chip cache

Channel 1: refresh generation
Channel 2: tone generator for speaker

clock/calendar + 4 K byte NVRAM

 Up to 65,536 colors on the TFT XGA

(1024x768) LCD

 Up to 16,777,216 colors on an external

monitor

See “Video Subsystem” on page 3-2 for more
details on the video subsystem.

DMA controller 1 Seven DMA channels (AT compatible:)

Four 8-bit channels and three 16-bit channels

Figure 1-2 (Part 1 of 2). System Board Devices and Features

System Overview 1-3

Device Type Features
Interrupt controller 1 15 levels of system interrupts

Keyboard/auxiliary
device controller

Diskette drive
controller

Serial controller
port

Parallel controller
port

Expansion bus
adapter (PCI-bus)

PCMCIA** slots – Conforms to the standards for:

Modem subsystem – Is driven by:

Infrared subsystem – Supports:

Universal serial bus
(USB)

1 Internal keyboard

2 Supports:

2 EIA-232-E interface (16550 compatible)

1 Programmable as parallel port 1, 2, or 3

– Supports externally attached devices:

– Supports:

(interrupts are edge-triggered)
TrackPoint

Auxiliary device connector
Password security

 3.5-in. diskette (1.44 MB)
 3.5-in. diskette (1.2 MB)
 3.5-in. diskette (720 KB)

Programmable as serial port 1, 2, 3, or 4
One 9-pin, D-sub connector

IEEE P1284-A compatible
Supports bidirectional input and output
Enhanced Parallel Port (EPP) compatible
Extended Capabilities Port (ECP) compatible

 SelectaDock docking system

 Port replicator

 CardBus

 Two Type I or II PC cards
 One Type III PC card

 MDSP 3780i

 SRAM 32 Kb by 40 bits

 Crystal Audio

 Voice band CODEC for modem

 Internal DAA

 Internal omnidirectional microphone

 ThinkPad IR/SIR/D-ASK (500 KHz) IR

 USB input and output devices

Figure 1-2 (Part 2 of 2). System Board Devices and Features

1-4 System Overview

System Board I/O Address Map

Figure 1-3 is the I/O address map.

Address (Hex) Device

0000–001F DMA Controller (0–3)
0020, 0021 Interrupt Controller (master)
0022–002F Reserved
0040–0043 System Timer 1
0048–004B Reserved
0060 Keyboard, Auxiliary Device
0061 System Control Port B
0062, 0066 Slave Controller
0064 Keyboard, Auxiliary Device
0070, 0071 RT/CMOS and NMI Mask
0072, 0073 Extended RT and CMOS
0074, 0075, 0076 Reserved
0081–0083, 0087 DMA Page Registers (0–3)
0089–008B, 008F DMA Page Registers (4–7)
0092 System Control Port A
0096 Reserved
0098 System Flash ROM Control Register (DCR

00A0, 00A1 Interrupt Controller (slave)
00B2–00B3 Power Management Register
00C0–00DF DMA Controller (4–7)
00F0–00FF Reserved
0130–013F ThinkPad Modem
0170–0177 Secondary IDE Registers
01F0–01F7 Primary IDE Registers
0201 Joystick Port
0220–0233 Audio Subsystem - Sound Blaster
0240–0253 Audio Subsystem - Sound Blaster
026E, 026F Super I/O Configuration Registers
0260–0273 Audio Subsystem - Sound Blaster
0278–027A Parallel Port 3
027B–027F Reserved
0280–0283 Audio Subsystem - Sound Blaster
02E8–02EF Serial Port 4
02E8–02EF IR Port 4
02F8–02FF Serial Port 2
02F8–02FF IR Port 2
0300–0303 MIDI Port 1
0310–0313 MIDI Port 2
0320–0323 MIDI Port 3

2282)

Figure 1-3 (Part 1 of 2). System Board I/O Address Map

System Overview 1-5

Address (Hex) Device

0330–0333 MIDI Port 4
0350–035F ThinkPad Modem
0376, 0377 Secondary IDE Registers
0378–037A Parallel Port 2
037B–037F Reserved
0388–038B Audio Subsystem - FM Synthesizer
0398–0399 Reserved
03B4, 03B5, 03BA Video Subsystem
03BC–03BE Parallel Port 1
03C0–03C5 Video Subsystem
03C6–03C9 Video DAC
03CA, 03CC, 03CE, 03CF, Video Subsystem
03D4, 03D5, 03DA,
03D8–03DA
03E0–03E1 PCMCIA Interface (DCR 2959)
03E8–03EF Serial Port 3
03E8–03EF IR Port 3
03F0–03F5, 03F7 Diskette-Drive Controller
03F6, 03F7 Primary IDE Registers
03F8–03FF Serial Port 1
03F8–03FF IR Port 1
0530–0537 Audio - WSS 1
0538–053F Audio Control Port 1
0604–060B Audio - WSS 2
0770–077F ThinkPad Modem
0CF8–0CFB PCI Configuration Address Register
0CFC–0CFF PCI Configuration Data Register
0DB0–0DBF ThinkPad Modem
0D38–0D3F Audio Control Port 2
0E80–0E87 Audio - WSS 3
0E88–0E8F Audio Control Port 3
0F40–0F47 Audio - WSS 4
0FF0–0FF7 Audio Control Port 4
15E8–15EF Power Management Register
2120–21FF Reserved
23C0–23C7 Reserved
46E8 Video Subsystem Enable
EF00–EF37 Power Management Register
EFA0–EFAD SMBus IO Space Register
F104 Reserved

Figure 1-3 (Part 2 of 2). System Board I/O Address Map

1-6 System Overview

Specifications

Figure 1-4 to Figure 1-7 on page 1-9 list the specifications for the
computers.

Performance Specifications

Device/Cycle

Microprocessor 200 or 233

L1 cache (64bit)

read/write hit

L2 cache (64bit) (for not all

models)

read hit (back-to-back)
write hit (back-to-back)

Memory (64bit) (see Note)

read, page hit
read, raw miss
read, page miss

posted write

write retire rate from

write buffer

Note:

The cycle times shown for access to system
board RAM are based on 70 ns EDO memory.

Clock Counts
(66 MHz)

MHz
1 CPUCLK
90 ns (60 ns)

90 ns (60 ns)

240 ns
285 ns
345 ns
90 ns
135 ns

Figure 1-4. Performance Specifications

System Overview 1-7

Physical Specifications

Size

Width: 313.0 mm (12.3 in.)
Depth: 240.0 / 254.0 mm (9.45 / 10.00 in.)
Height: 56.0 mm (2.20 in.)

Weightñ (approximate value)

Air Temperature

Humidity

Maximum altitudeò: 3,048 m (10,000 ft) in unpressurized conditions
Heat output: 56 W
Acoustical readings (see Figure 1-7 on page 1-9)
Electrical (see Figure 1-6 on page 1-9)
Electromagnetic compatibility: FCC class B

ñ With battery pack installed.
ò This is the maximum altitude at which the specified air temperatures apply. At

higher altitudes, the maximum air temperatures are lower than those specified.

3.4 kg (7.4 lb)

3.5 kg (7.7 lb)

System on (without diskette)

5.0°C to 35.0°C (41°F to 95°F)

System on (with diskette)

10.0°C to 35.0°C (50°F to 95°F)

System off

5.0°C to 43.0°C (41°F to 110°F)

System (without diskette)

8% to 95%

System (with diskette)

8% to 80%

Figure 1-5. Physical Specifications

1-8 System Overview

Electrical Specifications

(56 W)
Input voltageñ

(V ac)
Frequency (Hz) 50/60
Inputò (kVA) 0.13

ñ Range is automatically selected; sine wave input is required.
ò At maximum configuration.

100–240

Figure 1-6. Electrical Specifications

Acoustical Readings

L
Operate Idle Operate Idle Operate Idle
770 4.40 3.90 35.0 30.0 30.0 25.5
770 (with

SelectaDock
III)

Notes:

L

WAd

L

pAm

<L

pA>m

Operate Shows the value while using the hard disk drive.
All measurements made in accordance with ANSI S12.10 and reported in

conformance with ISO 9296.

in bels L

WAd

4.60 4.30 37.5 34.0 31.0 28.0

Is the declared sound power level for the random sample of
machines.

Is the mean value of the A-weighted sound pressure levels at the
operator position (if any) for the random sample of machines.

Is the mean value of the A-weighted sound pressure levels at the
1 meter position for the random sample of machines.

in dB <L

pAm

pA>m

in dB

Figure 1-7. Acoustical Readings

System Overview 1-9

Power Supply

The power supply converts the ac voltage to dc voltage and provides
power for the following:

 System board set
 Diskette drive

 Hard disk drive
 CD-ROM drive
 Auxiliary devices
 Keyboard
 LCD panel
 PCMCIA cards
 DVD drive

Voltages

The power supply generates six different dc voltages: VCC5M,
VCC3M, VCC12, and VCCSW. Figure 1-8 shows the maximum
current for each voltage.

Output Voltage (V dc) Current (A)

VCC5M +5.0 5.80
VCC3M +3.3 6.00

VCC12 +12.0 0.50

VCCSW +5.0 0.01

Figure 1-8. Power Supply Maximum Current

1-10 System Overview

Output Protection

A short circuit placed on any dc output (between two outputs or
between an output and a dc return) latches all dc outputs into a
shutdown state, with no hazardous condition to the power supply.

If an overvoltage fault occurs in the power supply, the power supply
latches all dc outputs into a shutdown state before any output
exceeds 135% of the nominal value of the power supply.

Voltage Sequencing

When power is turned on, the output voltages reach their operational
voltages within 2 seconds.

Power Supply Connector

The following connector is used with the AC adapter. The total
power capacity of this connector must not exceed 4.0 A.

Refer to Figure 1-9 for the appropriate adapter pin assignments.

Pin Voltage

1 +7.0 V dc to +17.0 V dc (depending on charging conditions)
2 Ground

Figure 1-9. Voltage Pin Assignments for the 56W AC Adapter

Battery Pack

The ThinkPad computer uses a lithium-ion (Li-ion) battery pack that
meets the following electrical specifications:

System Overview 1-11

Nominal Voltage +10.8 V dc
Capacity (average) 4.5 ampere hours (AH)
Protection Overcurrent protection

Overvoltage protection
Overdischarge protection
Thermal protection

Figure 1-10. Lithium-ion Battery Pack Specifications

1-12 System Overview

Section 2. System Board

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Cache Memory Operation .................... 2-2

Cacheable Address Space .................... 2-3

Bus Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Keyboard/Mouse Connector . . . . . . . . . . . . . . . . . . . . . 2-4

Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Scan Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Keyboard ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Displayable Characters and Symbols .............. 2-7

Hard Disk Drive Connector ..................... 2-8

External Bus Connector ....................... 2-9

UltraBay II Connector ....................... 2-12

Diskette Drive and Controller ................... 2-15

Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

ROM Subsystem . . . . . . . . . . . . . . . . . . . . . . . . 2-16

RAM Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

System Memory Map ...................... 2-17

System Board Memory for the DIMM Connectors ..... 2-18

RT/CMOS RAM . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

RT/CMOS Address and NMI Mask Register (Hex 0070) 2-20

RT/CMOS Data Register (Hex 0071) ........... 2-20

RT/CMOS RAM I/O Operations .............. 2-21

CMOS RAM Configuration ................. 2-25

Miscellaneous System Functions and Ports .......... 2-29

Nonmaskable Interrupt (NMI) ................. 2-29

System Control Port A (Hex 0092) .............. 2-30

System Control Port B (Hex 0061) .............. 2-31

Power-On Password . . . . . . . . . . . . . . . . . . . . . . 2-32

Other Passwords . . . . . . . . . . . . . . . . . . . . . . . . 2-32

Selectable Drive-Startup Sequence .............. 2-33

Hardware Compatibility . . . . . . . . . . . . . . . . . . . . . . 2-34

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

 Copyright IBM Corp. 1997 2-1

Description

This section describes the microprocessor, connectors, memory
subsystems, and miscellaneous system functions and ports for the
ThinkPad computers.

Microprocessor

The ThinkPad 770 uses the Intel Pentium 200 or 233 MHz
processor with the MMX technology.

The Processor has a 32-bit address bus and a 64-bit data bus. It is
software-compatible with all previous microprocessors. The
Processor has an internal, split data and instruction, 32KB write-back
cache. It includes pipelined math coprocessor functions and
superscalar architecture (two execution units).

Cache Memory Operation

In addition to the 32 KB of internal Level 1 (L1) cache memory in the
microprocessor, the system board of the ThinkPad 770 computer
contains an additional 256 KB of external Level 2 (L2) cache
memory.

The cache memory in the Intel Pentium microprocessor and the L2
external cache memory enable the microprocessor to read
instructions and data much faster than if the microprocessor had to
access system memory. When an instruction is first used or data is
first read or written, it is transferred to the cache memory from main
memory. This enables future accesses to the instructions or data to
occur much faster.

The cache is disabled and empty when the microprocessor comes
out of the reset state. The cache is tested and enabled during the
power-on self-test (POST).

The cache memory in the Intel Pentium microprocessor is loaded
from system memory in 32-byte increments, each referred to as a

cache line

reference to any byte contained in a cache line results in the entire
line being read into the cache memory (if the data was not already in
the cache). When the microprocessor gives up control of the system
bus, the cache memory enters “snoop” mode and monitors all write

2-2 System Board

. A cache line is aligned on a paragraph boundary. A

and read operations. If memory data is written to a location in the
cache and the cache line is in the “modified” state, the corresponding
cache line is written back to system memory and invalidated.

When the microprocessor performs a memory read, the data address
is used to find the data in the cache. If the data is found (a hit), it is
read from the cache memory and no external bus cycle occurs. If
the data is not found (a miss), an external bus cycle is used to read
the data from system memory. If the address of the missed data is
in cacheable address space, the data is stored in the cache memory
and the remainder of the cache line is read.

When the microprocessor performs a memory write, the data
address is used to search the cache. If the address is found (hit),
the data is written to the cache and no external bus cycle is used to
write the data to system memory. (If the address of the write
operation was not in the cache memory but was in cacheable
address space, the data is read back into the cache memory and the
remainder of the cache line is read.)

Cacheable Address Space

Cacheable address space is defined as system memory that resides
on the system board (0–640 KB and 1 MB–256 MB). Cacheability of
system memory is up to 64 MB in the L2 cache. Nothing in address
range hex A0000–BFFFF, I/O address space, or memory in any AT
slot is cached.

ROM address space (hex C0000–C9FFF and F0000–FFFFF) is L1
cacheable for
range is already in cache memory and the address range is written
to, the cached line is invalidated and is read again from RAM, where
the BIOS is shadowed.

Bus Adapter

When the computer is attached to the ThinkPad SelectaDock III
docking system, the PCI adapters or AT-bus adapters can be used
through the docking system.

code read operations only

. If data in this address

System Board 2-3

Keyboard/Mouse Connector

Each ThinkPad computer has a keyboard/mouse connector, where
the IBM mouse, keyboard, or numeric keypad is connected.

Signals

The keyboard and mouse signals are driven by open-collector drivers
pulled to 5 V dc through a pull-up resistor. Figure 2-1 lists the
signals.

Sink current 1 mA Maximum
High-level output voltage 5.0 V dc minus pullup Minimum
Low-level output voltage 0.5 V dc Maximum
High-level input voltage 2.0 V dc Minimum
Low-level input voltage 0.8 V dc Maximum

Figure 2-1. Keyboard and Mouse Signals

Connector

The keyboard/mouse connector uses a 6-pin, miniature DIN
connector.

56

34

12

Pin I/O Signal Name

1 I/O Mouse Data
2 I/O Keyboard Data
3–Ground
4–+5 V dc
5 I/O Mouse Clock
6 I/O Keyboard Clock

Figure 2-2. Keyboard/Mouse Connector Pin Assignments

Note: The maximum current for +5 V dc (pin 4) is 0.5 A for both the

mouse and the numeric keypad.

2-4 System Board

Scan Codes

Figure 2-3 shows the key numbers assigned to keys on the 84-key
keyboard (for the U.S. and Japan). Figure 2-4 on page 2-6 shows
the key numbers assigned to keys on the 85-key keyboard (for
countries other than the U.S. and Japan). For scan codes assigned
to each numbered key, refer to the

Interface Technical Reference

IBM Personal System/2 Hardware

.

Figure 2-3. Key Numbers for the 84-Key Keyboard

System Board 2-5

Figure 2-4. Key Numbers for the 85-Key Keyboard

Keyboard ID

The keyboard ID consists of 2 bytes: hex 83AB (the built-in keyboard
with the external numeric keypad) or hex 84AB (the built-in keyboard
only). Interrupt 16H, function code (AH)=0AH, returns the keyboard
ID.

2-6 System Board

Figure 2-5 shows the key numbers assigned to keys on the external
numeric keypad. For scan codes assigned to each numbered key,
refer to the

Reference

IBM Personal System/2 Hardware Interface Technical

.

90 95

91

96

92

97

93

98

99

100

101

102

103

104

105

106

108

Figure 2-5. Key Numbers for the External Numeric Keypad

Displayable Characters and Symbols

For displayable characters and symbols that are keyable from the
keyboard, refer to the

Technical Reference

IBM Personal System/2 Hardware Interface

.

System Board 2-7

Hard Disk Drive Connector

The hard disk drive connected to the system board is removable.
Figure 2-6 shows the pin assignments for the connector on the
system board.

Pin Signal I/O or Feature Pin Signal I/O or Feature

1 DetectIn O 31 GND Ground
2 Jumper A NC 32 NC NC
3 Jumper B O 33 -PDREQ I
4 Jumper C O 34 GND Ground
5 Jumper D O 35 -PDIOW O
6 RSTDRV O 36 GND Ground
7 GND Ground 37 -PDIOR O
8 PDD7 I/O 38 GND Ground

9 PDD8 I/O 39 PIORDY I
10 GND Ground 40 CSEL O
11 PDD6 I/O 41 -PDACK O
12 PDD9 I/O 42 GND Ground
13 GND Ground 43 IRQ14HDD I
14 PDD5 I/O 44 -IOCS16 I
15 PDD10 I/O 45 PDA1 O
16 GND Ground 46 -PDIAGHDD O
17 PDD4 I/O 47 GND Ground
18 PDD11 I/O 48 PDA0 O
19 GND Ground 49 PDA2 O
20 PDD3 I/O 50 -CS1P O
21 PDD12 I/O 51 -CS3P O
22 GND Ground 52 -DASPHDD I
23 PDD2 I/O 53 GND Ground
24 PDD13 I/O 54 VCC5B Vcc
25 GND Ground 55 VCC5B Vcc
26 PDD1 I/O 56 VCC5B Vcc
27 PDD14 I/O 57 VCC5B Vcc
28 GND Ground 58 Reserved NC
29 PDD0 I/O 59 -HDDDETECTI
30 PDD15 I/O 60 GND Ground

Figure 2-6. Hard Disk Drive Connector Pin Assignments

2-8 System Board

External Bus Connector

The docking station is connected through the 240-pin external bus
connector on the rear panel. This connector is installed on the
system board and has the following pin assignments:

1

121

60 180

240 120

18161

Type Legend:

A: Audio signal M: PC Card signal
C: System control signal P: PCI-bus signal
F: Diskette drive signal R: Reserved
G: Ground S: Serial port signal
I: IDE hard disk drive signal T: ISA-bus signal
J: Joy stick / Midi U: USB
K: Keyboard/mouse signal V: Video signal
L: Parallel port W: Power line

System Board 2-9

Pin Type Signal Name Pin Type Signal Name

001 W VCC5A 061 W Dock-PWR
002 W VCC5A 062 W Dock-PWR
003 P -PCIRST 063 W Dock-PWR
004 G GND 064 W Dock-PWR
005 P -ACK_GNT 065 A L_OUT
006 P -CLKRUN 066 A AGND
007 G GND 067 A L_IN
008 P AD30 068 G GND
009 P AD28 069 K KBDATA
010 G GND 070 K MSDATA
011 P AD26 071 K MSCLK
012 P AD24 072 G GND
013 G GND 073 S -RI
014 P AD23 074 S -CTS
015 P AD21 075 S -DTR
016 G GND 076 S RXD
017 P AD19 077 G GND
018 P AD17 078 P AD0
019 G GND 079 P AD2
020 P CBE2 080 G GND
021 P -IRDY 081 P AD4
022 G GND 082 P AD6
023 P -DEVSEL 083 G GND
024 R Reserved 084 P CBE0
025 G GND 085 P AD9
026 P -SERR 086 G GND
027 P PAR 087 P AD11
028 R Reserved 088 P AD13
029 R Reserved 089 R R/-S
030 R Reserved 090 R Reserved
031 R Reserved 091 R Reserved
032 P AD14 092 R Reserved
033 P AD12 093 P AD15
034 G GND 094 P CBE1
035 P AD10 095 G GND
036 P AD8 096 P -PERR
037 G GND 097 P -STOP
038 P AD7 098 G GND
039 P AD5 099 P -TRDY
040 G GND 100 P -FRAME
041 P AD3 101 G GND
042 P AD1 102 P AD16
043 G GND 103 P AD18
044 P PRDY 104 G GND
045 R Reserved 105 P AD20
046 G GND 106 P AD22
047 S -DCD 107 G GND
048 S TXD 108 P CBE3
049 S -RTS 109 P AD25
050 S -DSR 110 G GND
051 W KBD_+5V 111 P AD27
052 K KBCLK 112 P AD29
053 G GND 113 G GND
054 A R_IN 114 P AD31
055 A AGND 115 P -REQ
056 A R_OUT 116 G GND
057 W Dock-POR 117 P PCICLK
058 W Dock-POR 118 C -BATOPDSBL
059 W Dock-POR 119 W VCC5B
060 W Dock-POR 120 W VCC5B

2-10 System Board

Pin Type Signal Name Pin Type Signal Name

121 C -DOCK_ID1 181 C -DOCK_ID2
122 P IRQSER 182 G GND
123 G GND 183 U USBP1­124 T IRQ5 184 U UDBP1+
125 T IRQ7 185 R Reserved
126 T IRQ10 186 G GND
127 T IRQ11 187 C 12C_DATA
128 T IRQ14 188 J JBCY
129 G GND 189 J JBCX
130 P -INTB 190 J JBB2
131 P -INTC 191 G GND
132 P -INTD 192 J JBB1
133 I -DASP 193 J MIDIOUT
134 G GND 194 J MIDIIN
135 V CRTID0 195 C -PWRSWITCH
136 V CDTID2 196 G GND
137 V DDCCLK_ID3 197 C -BUSSUSSTAT
138 V CRT_RED 198 M -PCMCIA_RI
139 G GND 199 F -SIDE1SEL
140 L SLCT 200 G GND
141 L PE 201 F DRATE0
142 L BUSY 202 F -WREN
143 L D7 203 F -DRVID1
144 G GND 204 F -DIR
145 L D3 205 G GND
146 L D2 206 F -MOTEN1
147 L D1 207 F -DISKCHG
148 L D0 208 F -INDEX
149 L AFD 209 F -RDDATA
150 G GND 210 G GND
151 G GND 211 G GND
152 L -ERR 212 L -STB
153 F -WRDATA 213 L -INIT
154 G GND 214 L -SLIN
155 F DRVSEL1 215 G GND
156 F -DRVID0 216 L D4
157 F -MEDID0 217 L D5
158 F DRATE1 218 L D6
159 G GND 219 L -ACK
160 F -STEP 220 G GND
161 F -MEDID1 221 V CRT_GREEN
162 F -TRACK0 222 G GND
163 F -WPROTECT 223 V CRT_BLUE
164 G GND 224 V DDCDATA_ID1
165 C -PWRON 225 V VSYNC
166 C POWERGOOD 226 V HSYNC
167 C UNI_SMI 227 G GND
168 M SPKR 228 I -PHLDA
169 G GND 229 I -PHLD
170 J JAB1 230 G GND
171 J JAB2 231 P -INTA
172 J JACX 232 I IDE2IRQ
173 J JACY 233 T IRQ15
174 G GND 234 T IRQ12
175 C I2C_CLK 235 T IRQ9
176 C SUSCLK 236 T IRQ6
177 R Reserved 237 T IRQ4
178 U USB_OC1 238 T IRQ3
179 G GND 239 G GND
180 C -DOCK_ID3 240 C -DOCK_ID0

Figure 2-7. 240-Pin External Bus Connector Pin Assignments

System Board 2-11

UltraBay II Connector

The removable diskette drive, secondary hard disk drive, DVD drive,
or CD-ROM drive can be connected to the UltraBay II connector on
the system board. This connector has the following pin assignments.

2-12 System Board

Pin Signal I/O and Feature

1 UBAYID1 I
2 UBAYID2 I
3 GND GND
4 GND GND
5 -INDEX I
6 -DRVSEL0 O
7 -DISKCHG I
8 -DRVID0 I

9NC N/C
10 -MEDID0 I
11 -MONTEN0 O
12 DRATE1 O
13 -DIR O
14 -DRVID1 I
15 -STEP 0
16 GND GND
17 -WRDATA O
18 GND GND
19 -WREN O
20 -MEDID1 I
21 -TRACK0 I
22 DRATE0 O
23 -WPROTECT I
24 -RDDATA I
25 GND GND
26 -SIDE1SEL O
27 UBAYID0 O
28 RSTDRV O
29 GND GND
30 DD7 I/O
31 DD8 I/O
32 DD6 I/O
33 DD9 I/O
34 GND GND
35 DD5 I/O
36 DD10 I/O
37 DD4 I/O
38 DD11 I/O
39 VCC5B VCC
40 VCC5B VCC
41 VCC5B VCC
42 VCC5B VCC
43 DD3 I/O
44 DD12 I/O
45 DD2 I/O
46 DD13 I/O
47 GND GND
48 DD1 I/O
49 DD14 I/O
50 DD0 I/O

Figure 2-8 (Part 1 of 2). UltraBay II Connector Pin Assignments

System Board 2-13

Pin Signal I/O and Feature

51 DD15 I/O
52 GND GND
53 -UBAY_HDD I
54 DMARQ I
55 GND GND
56 -DIOW O
57 GND GND
58 -DIOR O
59 GND GND
60 IORDY I
61 CSEL O
62 -DMACK O
63 IRQ I
64 -IOCS16 I
65 DA1 O
66 -PDIAG I/O
67 DA0 O
68 DA2 O
69 -CS1 O
70 -CS3 O
71 -DASP I
72 -MCS O
73 CD_MUTE I
74 AUDIO_RTN I
75 CD_L_IN I
76 CD_R_IN I
77 GND GND
78 GND GND
79 UBAYID3 I
80 UBAYID4 I

Figure 2-8 (Part 2 of 2). UltraBay II Connector Pin Assignments

2-14 System Board

Diskette Drive and Controller

Figure 2-9 shows the read, write, and format capabilities of the
diskette drive for the ThinkPad computer.

Format Size

Diskette Type

3.5-inch 1.0 MB Diskette RWF − −

3.5-inch 2.0 MB Diskette − RWF RWF

Legend: :

1 KB (kilobyte) 1024 bytes
1 MB (megabyte) 1,048,576 bytes
R Read
W Write
F Format

Figure 2-9. Diskette Drive Read, Write, and Format Capabilities

720 KB 1.2 MB 1.44 MB

System Board 2-15

Memory

The ThinkPad computers use the following types of memory:

 Read-only memory (ROM)
 Random access memory (RAM)
 Real-time clock/complementary metal-oxide semiconductor RAM

(RT/CMOS RAM)

ROM Subsystem

The ROM subsystem consists of four banks of 128 KB memory.
ROM is active when power is turned on and is assigned to the top of
the first and last 1 MB of address space (hex 000F0000–000FFFFF
and hex FFFF0000–FFFFFFFF). After POST checks that system
memory is operating correctly, the ROM code is copied to RAM at
the same address space, and ROM is disabled.

RAM Subsystem

The RAM subsystem on the system board starts at address
hex 00000000 of the address space. The RAM subsystem for the
ThinkPad 770 is 64 bits wide.

The 32 MB base memory is on the system board. Two 144-pin
8-byte dual inline memory module (DIMM) connectors are provided
on the system board. Both connectors accept an 8 MB, a 16 MB, a
32 MB, a 64 MB, or a 128 MB DIMM. The memory capacity can be
increased up to 256 MB. When two 128 MB DIMMs are installed,
the base 32 MB memory on the system board becomes inoperative.

The total amount of usable memory is less than the amount of
memory installed because of ROM-to-RAM remapping and power
management.

2-16 System Board

System Memory Map

Memory is mapped by the memory controller registers.
Figure 2-10 on page 2-17 shows the memory map for a correctly

functioning system. Memory can be mapped differently if POST
detects an error in system board memory or RT/CMOS RAM. In the
figure, the variable
system board memory starting at or above the hex 100000 boundary.

Hex Address Range Function

00000000 to 0009FFFF 640 KB system board RAM
000A0000 to 000BFFFF Video RAM
000C0000 to 000C9FFF System board video BIOS ROM mapped to

000C8000 to 000EFFFF Channel ROM
000F0000 to 000FFFFF 64 KB system board ROM mapped to RAM
00100000 to (00100000 +

MB)
FFFF0000 to FFFFFFFF 64 KB system board ROM

Figure 2-10. System Memory Map

x

represents the number of 1 MB blocks of

RAM

x

x

MB system board RAM

(same as 000F0000 to 000FFFFF)

System Board 2-17

System Board Memory for the DIMM Connectors

The system board has two DIMM connectors.
Figure 2-11 shows the pin assignments for the DIMM connector.

Pin Signal Pin Signal Pin Signal Pin Signal

1

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

Vss

2

Vss

3

DQ0

4

DQ32

5

DQ1

6

DQ33

7

DQ2

8

DQ34

9

DQ3
DQ35
Vcc
Vcc
DQ4
DQ36
DQ5
DQ37
DQ6
DQ38
DQ7
D39
Vss
Vss
DQMB0
DQMB4
DQMB1
DQMB5
Vcc
Vcc
A0
A3
A1
A4
A2
A5
Vss
Vss
DQ8

38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74

D40
DQ9
DQ41
DQ10
DQ42
DQ11
DQ43
Vcc
Vcc
DQ12
DQ44
DQ13
DQ45
DQ14
DQ46
DQ15
DQ47
Vss
Vss
Reserved
Reserved
Reserved
Reserved
CK
CKE
Vcc
Vcc
/RAS
/CAS
/WE
RFU
/S0
RFU
/S1
RFU
RFU
RFU

75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98

99
100
101
102
103
104
105
106

107
108
109

Vss
Vss
Reserved
Reserved
Reserved
Reserved
Vcc
Vcc
DQ16
DQ48
DQ17
DQ49
DQ18
DQ50
DQ19
DQ51
Vss
Vss
DQ20
DQ52
DQ21
DQ53
DQ22
DQ54
DQ23
DQ55
Vcc
Vcc
A6
A7
A8
A11
(BS0)
Vss
Vss
A9

110
111
112

113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

A12
(BS1)
A10
(AP)
A13
Vcc
Vcc
DQMB2
DQMB6
DQMB3
DQMB7
Vss
Vss
DQ24
DQ56
DQ25
DQ57
DQ26
DQ58
DQ27
DQ59
Vcc
Vcc
DQ28
DQ60
DQ29
DQ61
DQ30
DQ62
DQ31
DQ63
Vss
Vss
SDA
SCL
Vcc
Vcc

Figure 2-11. DIMM Adapter Card Memory Connector Pin Assignments

2-18 System Board

RT/CMOS RAM

The RT/CMOS RAM (real-time clock/complementary metal-oxide
semiconductor RAM) module contains the real-time clock and 128
bytes of CMOS RAM. The clock circuitry uses 14 bytes of this
memory; the remainder is allocated to configuration and
system-status information. A battery is built into the module to keep
the RT/CMOS RAM active when the power supply is not turned on.
In addition to the 128 bytes of CMOS/RAM, a CMOS/RAM extension
of 4 KB is provided for configuration and other system information.

Figure 2-12 lists the RT/CMOS RAM bytes and their addresses.

Address (Hex) RT/CMOS RAM Bytes

000–00D Real-time clock
00E Diagnostic status
00F Shutdown status
010 Diskette drive type
011 Hard disk 2 and 3 drive type
012 Hard disk 0 and 1 drive type
013 Reserved
014 Equipment
015, 016 Low and high base memory
017, 018 Low and high expansion memory
019 Hard disk 0 extended byte
01A Hard disk 1 extended byte
01B Hard disk 2 extended byte
01C Hard disk 3 extended byte
01D–02D Reserved
02E, 02F Checksum
030, 031 Low and high usable memory above 1 MB
032 Date-century
033–07F Reserved

Figure 2-12. RT/CMOS RAM Address Map

System Board 2-19

RT/CMOS Address and NMI Mask Register (Hex 0070)

The NMI mask register is used with the RT/CMOS data register (hex

0071) to read from and write to the RT/CMOS RAM bytes.

Attention

The operation following a write to hex 0070 should access hex 0071;
otherwise, intermittent failures of the RT/CMOS RAM can occur.

Bit Function

7 NMI mask
6–0 RT/CMOS RAM address

Figure 2-13. RT/CMOS Address and NMI Mask Register (Hex 0070)

Bit 7 When this write-only bit is set to 1, the NMI is masked

(disabled). This bit is set to 1 by a power-on reset.

Bits 6–0 These bits are used to select RT/CMOS RAM

addresses.

RT/CMOS Data Register (Hex 0071)

The RT/CMOS data register is used with the RT/CMOS address and
NMI mask register (hex 0070) to read from and write to the
RT/CMOS RAM bytes.

Bit Function

7–0 RT/CMOS data

Figure 2-14. RT/CMOS Data Register (Hex 0071)

2-20 System Board

RT/CMOS RAM I/O Operations

During I/O operations to the RT/CMOS RAM addresses, you should
mask interrupts to prevent other interrupt routines from changing the
RT/CMOS address register before data is read or written. After I/O
operations, you should leave the RT/CMOS address and NMI mask
register (hex 0070) pointing to status register D (hex 00D).

Attention

The operation following a write to hex 0070 should access hex 0071;
otherwise, intermittent failures of the RT/CMOS RAM can occur.

Writing to the RT/CMOS RAM requires the following:

1. Write the RT/CMOS RAM address to the RT/CMOS address and
NMI mask register (hex 0070).

2. Write the data to the RT/CMOS data register (hex 0071).

3. Write the address, hex 0F, to the RT/CMOS and NMI mask
register; this leaves hex 0070 pointing to the shutdown status
byte (hex 0F).

4. Read address hex 0071 to restore the RT/CMOS.

Reading from the RT/CMOS RAM requires the following steps:

1. Write the RT/CMOS RAM address to the RT/CMOS and NMI
mask register (hex 0070).

2. Read the data from the RT/CMOS data register (hex 0071).

3. Write the address, hex 0F, to the RT/CMOS and NMI mask
register; this leaves hex 0070 pointing to the shutdown status
byte (hex 0F).

4. Read address hex 0071 to restore the RT/CMOS.

System Board 2-21

Real-Time Clock Bytes (Hex 000–00D):

Bit definitions and

addresses for the real-time clock bytes are shown in Figure 2-15.

Address
(Hex)

000 Seconds 0
001 Second alarm 1
002 Minutes 2
003 Minute alarm 3
004 Hours 4
005 Hour alarm 5
006 Day of week 6
007 Date of month 7
008 Month 8
009 Year 9
00A Status register A 10
00B Status register B 11
00C Status register C 12
00D Status register D 13

Figure 2-15. Real-Time Clock Bytes (Hex 000–00D)

Function

Byte Number

Note: The setup program initializes status registers A and B when

the time and date are set. Interrupt 1AH is the BIOS
interface to read and set the time and date; it initializes the
registers in the same way that the setup program does.

Status Register A (Hex 00A)

Bit Function

7 Update in progress (UIP)
6 Countdown chain

5 Oscillator enable

4 Bank select
3–0 Rate-selection bits

1 - resets countdown chain
0 - countdown chain enabled

0 - oscillator off
1 - oscillator on

Figure 2-16. Status Register A (Hex 00A)

Bit 7 This bit is a status flag that can be monitored. If this bit

is 1, the update transfer will soon occur. If this bit 0, the
update transfer will not occur for at least 244 µs.

2-22 System Board

Bits 6–5 If these bits are a pattern of 01, the oscillator is turned

on and the RTC is allowed to keep time. The next
update will occur at 500 ms after a pattern of 01 is
written to these bits.

Bits 4 To use the original bank of memory, select 0. To use

the extended registers, select 1.

Bits 3–0 These bits allow the selection of a divider output

frequency or disable the divider output.

Status Register B (Hex 00B)

Bit Function

7 Set
6 Enable periodic interrupt
5 Enable alarm interrupt
4 Enable update-ended interrupt
3 Enable square wave
2 Date mode
1 24-hour mode
0 Enable daylight-saving time

Figure 2-17. Status Register B (Hex 00B)

Bit 7 If set to 0, this bit updates the cycle, normally by

advancing the count at a rate of one cycle per second. If
set to 1, it immediately ends any update cycle in
progress, and the program can initialize the 14 time bytes
without any further updates occurring until this bit is set
to 0.

Bit 6 This is a read/write bit that allows an interrupt to occur at

a rate specified by the rate and divider bits in status
register A. If set to 1, this bit enables the interrupt. The
system initializes this bit to 0.

Bit 5 If set to 1, this bit enables the alarm interrupt. The

system initializes this bit to 0.

Bit 4 If set to 1, this bit enables the update-ended interrupt.

The system initializes this bit to 0.

Bit 3 If set to 1, this bit enables the square-wave frequency as

set by the rate-selection bits in status register A. The
system initializes this bit to 0.

System Board 2-23

Bit 2 This bit indicates whether the binary-coded-decimal (BCD)

or binary format is used for time-and-date calendar
updates. If set to 1, this bit indicates binary format. The
system initializes this bit to 0.

Bit 1 This bit indicates whether the hours byte is in 12-hour or

24-hour mode. If set to 1, this bit indicates the 24-hour
mode. The system initializes this bit to 1.

Bit 0 If set to 1, this bit enables the daylight-saving-time mode.

If set to 0, this bit disables the daylight-saving-time mode,
and the clock reverts to standard time. The system
initializes this bit to 0.

Status Register C (Hex 00C)

Bit Function

7 Interrupt request flag
6 Periodic interrupt flag
5 Alarm interrupt flag
4 Update-ended interrupt flag
3–0 Reserved

Figure 2-18. Status Register C (Hex 00C)

Note: Interrupts are enabled by bits 6, 5, and 4 in status register B.
Bit 7 If set to 1, this bit indicates that an interrupt has

occurred; bits 6, 5, and 4 indicate the type of interrupt.

Bit 6 If set to 1, this bit indicates that a periodic interrupt has

occurred.

Bit 5 If set to 1, this bit indicates that an alarm interrupt has

occurred.

Bit 4 If set to 1, this bit indicates that an update-ended

interrupt has occurred.

Bits 3–0 These bits are reserved.

Status Register D (Hex 00D)

Bit Function

7 Valid RAM
6–0 Reserved

Figure 2-19. Status Register D (Hex 00D)

2-24 System Board

Bit 7 This read-only bit monitors the internal battery. If set to

1, this bit indicates that the real-time clock has power. If
set to 0, it indicates that the real-time clock has lost
power and the data in CMOS is no longer valid.

Bits 6–0 These bits are reserved. CMOS RAM Configuration

Figure 2-20 shows the bit definitions for the CMOS RAM
configuration bytes.

Diagnostic Status Byte (Hex 00E)

Bit Function

7 Real-time clock power
6 Configuration record and checksum status
5 Incorrect configuration
4 Memory size mismatch
3 Hard disk controller/drive C initialization status
2 Time status indicator
1, 0 Reserved

Figure 2-20. Diagnostic Status Byte (Hex 00E)

Bit 7 If set to 1, this bit indicates that the real-time clock has

lost power.

Bit 6 If set to 1, this bit indicates that the checksum is incorrect.
Bit 5 This bit indicates the results of a power-on check of the

equipment byte (hex 014). If set to 1, this bit indicates
that the configuration information is incorrect.

Bit 4 If set to 1, this bit indicates that the memory size does not

match the configuration information.

Bit 3 If set to 1, this bit indicates that the controller or hard disk

drive failed initialization.

Bit 2 If set to 1, this bit indicates that the time is invalid.
Bits 1, 0 These bits are reserved.

Shutdown Status Byte (Hex 00F):

This byte is defined by the

power-on diagnostic programs.

System Board 2-25

Diskette Drive Type Byte (Hex 010):

This byte indicates the type

of the installed diskette drive.

Bit Drive Type

7–4 Diskette drive type
3–0 Reserved

Figure 2-21. Diskette Drive Type Byte (Hex 010)

Bits 7–4 These bits indicate the diskette drive type.

Bits 7–4 Description

0 1 1 0

0 1 0 0

Note: Combinations not shown are reserved.

Diskette drive (2.88MB)
Diskette drive (1.44MB)

Figure 2-22. Diskette Drive Type Bits 7–4

Bits 3–0 These bits are reserved.

Hard Disk Drive Type Byte (Hex 011):

This byte defines the type
of hard disk drive installed. Hex 00 indicates that no hard disk drive
is installed.

Bit Drive Type

7–4

3–0

Hard disk drive type 2
Hard disk drive type 3

Figure 2-23. Hard Disk Type Byte (Hex 011)

Bit 7–4 Description

0 0 0 0
1 1 1 1

No drive installed for hard disk drive 2
Use CMOS 1BH for hard disk drive 2

Figure 2-24. Hard Disk Drive Type 2 (Bits 7–4)

Bit 3–0 Description

0 0 0 0
1 1 1 1

No drive installed for hard disk drive 3
Use CMOS 1CH for hard disk drive 3

Figure 2-25. Hard Disk Drive Type 3 (Bits 3–0)

2-26 System Board

Hard Disk Drive Type Byte (Hex 012):

This byte defines the type
of hard disk drive installed. Hex 00 indicates that no hard disk drive
is installed.

Bit Drive Type

7–4 Hard disk drive 0
3–0 Hard disk drive 1

Figure 2-26. Hard Disk Drive Type Byte

Reserved Bytes (Hex 013):
Equipment Byte (Hex 014):

These bytes are reserved.

This byte defines the basic equipment

in the system for the power-on diagnostic tests.

Bit Description

7, 6 Number of diskette drives
5, 4 Display operating mode
3, 2 Reserved
1 Coprocessor presence
0 Diskette drive 0 presence

Figure 2-27. Equipment Byte

Bits 7, 6 These bits indicate the number of installed diskette

drives.

Bits 7,6 Number of Diskette Drives

0 0 One drive
0 1 Reserved
1 0 Reserved
1 1 Reserved

Figure 2-28. Installed Diskette Drive Bits

Bits 5, 4 These bits indicate the operating mode of the display

attached to the video port.

Bits 5,4 Display Operating Mode

0 0 Reserved
0 1 40-column mode
1 0 80-column mode
1 1 Monochrome mode

Figure 2-29. Display Operating Mode Bits

System Board 2-27

Bits 3–2 These bits are reserved.
Bit 1 If set to 1, this bit indicates that a coprocessor is

installed.

Bit 0 If set to 1, this bit indicates that physical diskette drive 0

is installed.

Low and High Base Memory Bytes (Hex 015 and Hex 016):

low and high base memory bytes define the amount of memory
below the 640 KB address space.

The value in these bytes represents the number of 1 KB blocks of
base memory. For example, hex 0280 indicates 640 KB. The low
byte is hex 015; the high byte is hex 016.

The

Low and High Expansion Memory Bytes (Hex 017 and Hex

018):

of memory above the 1 MB address space.
The value in these bytes represents the number of 1 KB blocks of

expansion memory. For example, hex 0800 indicates 2048 KB. The
low byte is hex 017; the high byte is hex 018.

Reserved Bytes (Hex 01D–02D):
Configuration Checksum Bytes (Hex 02E and Hex 02F):

configuration checksum bytes contain the checksum character for
bytes hex 010 through hex 02D of the 64-byte CMOS RAM. The
high byte is hex 02E; the low byte is hex 02F.

The low and high expansion memory bytes define the amount

These bytes are reserved.

The

Low and High Usable Memory Bytes (Hex 030 and Hex 031):

The low and high usable memory bytes define the total amount of
contiguous memory from 1 MB to 20 MB.

The hexadecimal values in these bytes represent the number of 1
KB blocks of usable memory. For example, hex 0800 is equal to
2048 KB. The low byte is hex 30; the high byte is hex 31.

Date-Century Byte (Hex 032):

byte contain the binary-coded decimal value for the century. For
information about reading and setting this byte, refer to the

Personal System/2 and Personal Computer BIOS Interface

Reserved Bytes (Hex 033–07F):

2-28 System Board

Bits 7 through 0 of the date-century

IBM

.

These bytes are reserved.

Miscellaneous System Functions and Ports

This section provides information about nonmaskable interrupts
(NMIs), the power-on password, and hardware compatibility.

Nonmaskable Interrupt (NMI)

The NMI signals the system microprocessor that a channel check
timeout has occurred. This situation can cause lost data or an
overrun error on some I/O devices. The NMI masks all other
interrupts. The interrupt return (IRET) instruction restores the
interrupt flag to the state it was in before the interrupt occurred. A
system reset causes a reset of the NMI.

The NMI requests from system board channel check are subject to
mask control with the NMI mask bit in the RT/CMOS Address
register. See “RT/CMOS Address and NMI Mask Register (Hex

0070)” on page 2-20. The power-on default of the NMI mask is 1
(NMI disabled).

Attention

The operation following a write to hex 0070 should access hex 0071;
otherwise, intermittent failures of the RT/CMOS RAM can occur.

System Board 2-29

System Control Port A (Hex 0092)

Bit Function

7–4 Reserved
3 Security lock latch
2 Reserved (must be set to 0)
1 Alternate gate A20
0 Alternate hot reset

Figure 2-30. System Control Port A (Hex 0092)

Bits 7–4 These bits are reserved.
Bit 3 This bit provides a security lock for the secured area of

RT/CMOS. If this bit is set to 1, the 8-byte power-on
password is locked by the software. After this bit is set
by POST, it can be cleared only by turning the system
off.

Bit 2 This bit is reserved.
Bit 1 This bit is used to enable the ‘address 20’ signal (

when the microprocessor is in the real address mode. If
this bit is set to 0, A20 cannot be used in real mode
addressing. This bit is set to 0 during a system reset.

Bit 0 This bit provides an alternative method of resetting the

system microprocessor. This alternative method
supports operating systems requiring faster operation
than that provided on the IBM Personal Computer AT.
Resetting the system microprocessor switches the
microprocessor from protected mode to real address
mode.

This bit is set to 0 by either a system reset or a write
operation. If a write operation changes this bit from 0 to
1, the ‘processor reset’ signal is pulsed after the reset
has occurred. While the reset is occurring, the latch
remains set so that POST can read this bit. If the bit is
set to 0, POST assumes that the system was just
powered on. If the bit is set to 1, POST assumes that
the microprocessor has been switched from protected
mode to real mode.

If bit 0 is used to reset the system microprocessor to the
real mode, use the following procedure:

1. Disable all maskable and nonmaskable interrupts.

A20)

2-30 System Board

2. Reset the system microprocessor by writing a 1 to
bit 0.

3. Issue a Halt instruction to the system
microprocessor.

4. Reenable all maskable and nonmaskable interrupts.

If you do not follow this procedure, the results are
unpredictable.

Note: Whenever possible, use BIOS as an interface to

reset the system microprocessor to the real
mode. For more information about resetting the
system microprocessor, refer to the

IBM Personal
System/2 and Personal Computer BIOS
Interface

.

System Control Port B (Hex 0061)

Bit definitions for the write and read functions of this port are shown
in the following figures:

Bit Function

7–4 Reserved
3 Enable channel check
2 Enable PCI SERR#
1 Enable speaker data
0 Timer 2 gate to speaker

Figure 2-31. System Control Port B (Hex 0061, Write)

Bit Function

7 PCI SERR# (PCI error) status
6 Channel check status
5 Timer 2 output
4 Toggles with each refresh request
3 Enable channel check
2 Enable PCI SERR# (PCI error) check
1 Enable speaker data
0 Timer 2 gate to speaker

Figure 2-32. System Control Port B (Hex 0061, Read)

Bit 7 If a system board error occurs and the PCI SERR# line is

activated, this bit is set to 1.

System Board 2-31

Bit 6 If set to 1, this bit indicates that a channel check has

occurred.

Bit 5 If read, this bit indicates the condition of the timer/counter

2 ‘output’ signal.

Bit 4 If read, this bit toggles for each refresh request.
Bit 3 If set to 0, this bit enables the channel check. This bit is

set to 1 during a power-on reset.

Bit 2 If set to 0, this bit enables the PCI SERR#.
Bit 1 If set to 1, this bit enables the speaker data.
Bit 0 If set to 1, this bit enables the timer 2 gate.

Power-On Password

RT/CMOS RAM has 8 bytes reserved for the power-on password
and the check character. The 8 bytes are initialized to hex 00. The
microprocessor can access these bytes only during POST. After
POST is completed, if a power-on password is installed, the
password bytes are locked and cannot be accessed by any program.

During power-on password installation, the password (1 to 7
characters) is stored in the security space.

Installing the password is a function of the built-in system program

Easy-Setup

when it is installed, changed, or removed. After the power-on
password has been installed, it can be changed or removed only
during POST.

The computer also can have a keyboard password. For more
information, see the keyboard and auxiliary device controller section
of the

Reference

. The power-on password does not appear on the screen

IBM Personal System/2 Hardware Interface Technical

.

Other Passwords

In addition to the power-on password, the computer provides two
more passwords:

 The hard-disk password (HDP) protects the data on your

removable hard disk drive from being accessed by unauthorized
persons.

2-32 System Board

 The supervisor password protects the system information in

Easy-Setup from being changed by unauthorized persons.

For more information about these passwords, refer to the

User's Guide

.

ThinkPad

Selectable Drive-Startup Sequence

Selectable drive-startup (selectable boot) allows you to control the
startup sequence of the drives in your computer. The order in which
the computer looks for the drives for your operating system is the

drive-startup sequence

systems, you might want to change the drive-startup sequence to
load the operating system from the hard disk without first checking
the diskette drive, or to do a remote program load (RPL).

Attention

When changing your startup sequence, you must be extremely
careful when doing write operations (such as copying, saving, or
formatting). Your data or programs can be overwritten if you select
the wrong drive.

For more information about the selectable drive-startup sequence,
refer to the

ThinkPad User's Guide

. If you are working with multiple operating

.

System Board 2-33

Hardware Compatibility

The computer supports most of the interfaces used by the IBM
Personal Computer AT* and the Personal System/2* (PS/2*)
products. In many cases, the command and status organization of
these interfaces is maintained.

The functional interfaces for the computer are compatible with the
following:

 The Intel 8259 interrupt controllers (edge trigger mode).
 The Intel 8254 timers driven from 1.193 MHz (channels 0, 1, and

2).

 The Intel 8237 DMA controller-address/transfer counters, page

registers, and status fields only. The command and request
registers, and the rotate and mask functions, are not supported.
The mode register is partially supported.

 The NS16550 serial communications controller.
 The Intel Pentium microprocessor.
 The Intel 8086**, 8088**, 80286**, 80386**, and i486DX

microprocessors.

 The Intel 8087**, 80287**, 80387** math coprocessors.
 The Intel 82077AA** diskette drive controller.
 The keyboard interface at addresses hex 0060 and hex 0064.
 Display modes supported by the IBM Monochrome Display and

Printer Adapter, the IBM Color/Graphics Monitor Adapter, and the
IBM Enhanced Graphics Adapter.

 The parallel printer ports (Parallel 1, Parallel 2, and Parallel 3) in

compatibility mode.

2-34 System Board

Error Codes

POST returns a three or more character code message to indicate
the type of test that failed. Figure 2-33 lists the failure indicated with
the associated error code.

Error
Code

101 Interrupt failure.
102 Timer failure.
103 Timer interrupt failure.
104 Protected mode failure.
105 Last 8042 command not accepted.
107 NMI test failure.
108 Timer bus test failure.
109 Low meg-chip select test.
110 Planar parity.
111 I/O parity.
118 Planar parity error logged.
158 A supervisor password is set, but no hard disk password is set.
159 The hard disk password is not identical to the supervisor password.
161 Dead battery.
163 Date and time are not set; clock not updated.
173 CMOS CRC error.
174 Configuration error.
175 Bad EEPROM CRC 1.
177 Bad supervisor password checksum.
178 EEPROM is not functional.
179 NVRAM error log full.
183 Supervisor password is needed.
184 Bad power-on password checksum.
185 Corrupted startup boot sequence.
186 Inconsistency between EEPROM and security lock latch 2.
188 Bad EEPROM CRC 2.
189 Too many passwords attempted.
190 Critically low battery condition detected.
191

XX

195 Configuration mismatch error found during hibernation wake-up.
196 Critical error found during hibernation wake-up.
201 Memory data error.
202 Memory line error 00 through 15.
203 Memory line error 16 through 23.
215 Memory test failure on on-board memory.
221 ROM to RAM remap error.
301 Keyboard error.

Description

PM initialization error. (X can be any character.)

Figure 2-33 (Part 1 of 2). Error Codes

System Board 2-35

Error
Code

601 Diskette drive or controller error.
602 No valid boot record on diskette.
604 Invalid diskette drive error.
1101 Serial-A test failure.
1201 Serial-B test failure.
1701 Hard disk controller failure.
1780, 1790 Hard disk 0 error.
1781, 1791 Hard disk 1 error.
2401 System board video error.
8081 PCMCIA presence test failure (PCMCIA revision number also

8082 PCMCIA register test failure.
8601 System bus error (8042 mouse interface).
8602 External mouse error.
8603 System bus error or mouse error.
8611 System bus error (I/F between 8042 and IPDC).
8612 TrackPoint III error.
8613 System board or TrackPoint III error.
I9990301 Hard disk error.
I9990302 Invalid hard disk boot record.
I9990303 Bank-2 flash ROM checksum error.
I9990305 No bootable device.

Description

checked).

Figure 2-33 (Part 2 of 2). Error Codes

2-36 System Board

Section 3. Subsystems

Video Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Video Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Modem Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

ThinkPad Modem . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

MIDI Port Function ........................ 3-5

Sound Blaster Support Function ................ 3-5

Telephony (Modem) Function .................. 3-6

Audio Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

MIDI Port Function ........................ 3-7

Sound Blaster Support Function ................ 3-7

Audio Port Specifications ..................... 3-8

Infrared (IR) Subsystem ....................... 3-9

IRQ Level and DMA Channel .................. 3-9

Enhanced Video Subsystem ................... 3-10

Video Port Specification .................... 3-10

PCMCIA Subsystem . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

IDE Channel on the UltraBay II .................. 3-14

MIDI/Joystick Port . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

MIDI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Joystick Interface . . . . . . . . . . . . . . . . . . . . . . . . 3-14

This section describes the video, DSP, Audio, IR, Enhanced video,
and PCMCIA subsystems of the ThinkPad computers.

 Copyright IBM Corp. 1997 3-1

Video Subsystem

The video subsystem consists of the XGA video controller and video
random-access memory (VRAM). The video subsystem supports an
IBM thin-film transistor (TFT) as follows:

Color Depth Resolution

LCD
Type

XGA TFT 2 MB 65,536 16,777,216 1024×768

VRAM
Size

On the
LCD

On the
External
Display

On the
LCD

On the
External
Display

640×480
800×600
1024×768
1280×1024
1600×1200

The video subsystem also supports PS/2 analog displays without any
additional adapters.

Note: Use of any video subsystem features not documented in this

book can result in future incompatibility.

Color Resolution

640×480

65,536 colors

16,777,216 colors

800×600

1024×768

640×480
800×600

3-2 Subsystems

Video Modes

The video subsystem supports the modes listed in Figure 3-1 and
Figure 3-2 on page 3-4:

Expanded

Size

XGA

960×600

960×700

960×600

960×600

960×700

960×600

960×600

960×600

960×700

960×600

960×600

960×600

960×700

960×700

960×720

960×720

960×600

Pels

320×200

320×350

320×400

640×200

640×350

640×400

320×200

640×200

640×350

640×400

320×200

640×200

640×350

640×350

640×480

640×480

320×200

Max

Box

Buffer

Start

Pages88

Size

Address

8×8

8×14

B8000

B8000

888

8×16

8×8

B8000

B8000

8×14

B8000

811

8×16

8×8

B8000

B8000

8

8842211

8×8

8×14

8×16

B8000

B0000

B0000

8×8

8×8

A0000

A0000

8×14

8×14

A0000

A0000

8×16

8×16

A0000

A0000

1

8×8

A0000

Alpha-

numeric

Format

40×25

40×25

40×25

80×25

80×25

80×25

40×25

80×25

80×25

Colors1616

Type

Mode

(Hex)

A/N

0, 1

A/N

0*, 1*

161616

A/N

A/N

0#, 1#

2, 3

A/N

2*, 3*

1642

A/N

APA

2#, 3#

4, 5

APA

6

–

A/N

Figure 3-1. BIOS Video VGA Modes

80×25

40×25

80×25

80×25

–1616–16216

A/N

APA

APA

APA

7*

7#DEF101112

80×25

80×30

80×30

40×25

256

APA

APA

APA

APA

13

Subsystems 3-3

The following shows the video BIOS extended modes for the 770
(containing a video chip Trident Cyber 9397 and 2 MB VRAM):

PAL

TV Out

NTSC

o o

o o

o o

o o

o o

o o

o o

o o

o o

o

o

o

o

o

o

o

o

o

TFT

LCD

XGA o o o o o o o o o o1 o1 o1 o1 o o o o o o o o o

o o

o o

External Monitor

87i 96i 60 70 72 75 85

oo

o

o

o

o

o ooo

o ooo

o ooo

o ooo

o ooo

o ooo

o ooo

o ooo

o oo

o oo

o oo

o oo

o oo

o o o o o

o o o o o

o o o o

o o o o

o o o

o o o

VESA Mode

Number

(Hex)—100———101

Video Mode

VGA modes

640x400x256

640x400x32k

640x400x64k

640x400xTrue

640x480x256

110

111

112————

640x480x32k

640x480x64k

640x480xTrue

720x480x256

102

103

720x480x32k

720x480x64k

720x480xTrue

800x600x16

800x600x256

113

114

115

104

105

800x600x32k

800x600x64k

800x600xTrue

1024x768x16

1024x768x256

116

117

106

107——

1024x768x32k

1024x768x64k

1280x1024x16

1280x1024x256

1600x1200x16

1600x1200x256

Note:

Figure 3-2. Video BIOS Extended Modes—Trident 9397

3-4 Subsystems

: Supported by centering mode only.

1

o

Modem Subsystem

The modem subsystem is composed of a digital signal processor
(DSP) and a data access arrangement (DAA):

 General MIDI-compatible, 32-voice wave table synthesizer
 36.6-kbps data/fax modem

 Full-feature telephone
 Answering machine

 Headphone-free, full-duplex speaker phone

ThinkPad Modem

The modem subsystem provides three system settings: I/O address,
IRQ level, and DMA channel.

I/O Address IRQ Level DMA Channel

0130–013F (default)
0350–035F
0770–077F
0DB0–0DBF

IRQ 3
IRQ 4
IRQ 5
IRQ 7
IRQ 10 (default)
IRQ 11
IRQ 15

DMA 0
DMA 1
DMA 6
DMA 7 (default)

MIDI Port Function

The MIDI port function provides one system setting:

I/O Address

0300–0303
0310–0313
0320–0323
0330–0333 (default)

Sound Blaster Support Function

The Sound Blaster support function provides three system settings:
I/O address, IRQ level, and DMA channel.

Subsystems 3-5

I/O Address IRQ Level DMA Channel

0220–0233 (default)
0240–0253
0260–0273
0280–0293
0388–038B (synthesizer)

IRQ 5 (default)
IRQ 7
IRQ 10
IRQ 11

DMA 0
DMA 1 (default)
DMA 6
DMA 7

Telephony (Modem) Function

The telephony (modem) function provides the following settings:

Serial Port

COM1 (I/O: 03F8 - IRQ 4)
COM2 (I/O: 02F8 - IRQ 3) (default)
COM3 (I/O: 03E8 - IRQ 4)
COM4 (I/O: 02E8 - IRQ 3)

3-6 Subsystems

Audio Subsystem

The crystal audio subsystem provides 16-bit stereo audio with
high-quality FM music synthesis using four operators per voice. It
can record, compress, and play back voice, sound, and music with
built-in mixer controls. It consists of an embedded microprocessor,
16-bit stereo, 20-voice FM music synthesizer (or 18 simultaneous
4-operator voices), MIDI serial port compatible MPU401 UART mode,
DMA control, and ISA bus interface logic.

The AudioDrive provides the computer with the following audio
features:

 High-quality audio (44.1-kHz MPC-2 16-bit audio)
 General MIDI compatible, 32-voice wave table synthesizer
 Sound Blaster support

MIDI Port Function

The MIDI port I/O address is as follows (only when docked to the
docking station):

I/O Address

0300–0301
0330–0331 (default)

Sound Blaster Support Function

The Sound Blaster support function provides three system settings:
I/O address, IRQ level, and DMA channel.

I/O Address IRQ Level DMA Channel

0220–022F (default)
0240–024F
0338–038B (FM synthesizer)

IRQ 5 (default)
IRQ 7
IRQ 10
IRQ 11

DMA 0
DMA 1 (default)

Subsystems 3-7

Audio Port Specifications

 Audio Output:

– ⅛-inch mini-jack for headphone

– Headphone speaker output: 22 mW (32 ohm) maximum

– Maximum output level: 2.4 V pp

– Output impedance: 75 ohm

 Audio Input:

– ⅛-inch mini-jack for microphone or line input

– Microphone gain: 26-dB minimum, 48.5-dB maximum

– Maximum input level:

Microphone: 1255 mV pp
Line In: 4.0 V pp

– Input impedance:

Microphone: 47 k ohm
Line In: 30 k ohm

3-8 Subsystems

Infrared (IR) Subsystem

The IR subsystem supports the following functions:
 MIF/FIR mode

– 567 Kbps
– 1.152 Mbps
– 4.0 Mbps

 Sharp** mode

– 9,600 bps

The I/O address can be selected from the following with the system
utility program. The IR subsystem uses one serial port address and
one IR controller register address:

I/O Address

03F8–03FF Serial port 1 (default)
02F8–02FF Serial port 2
03E8–03EF Serial port 3
02E8–02EF Serial port 4
03F8–03FF IR controller register 1 (default)
02F8–02FF IR controller register 2
03E8–03EF IR controller register 3
02E8–02EF IR controller register 4

IRQ Level and DMA Channel

The IR subsystem uses one IRQ level and two DMA channels for
ThinkPad mode. (Generic mode and Sharp mode do not require
DMA channels.)

IRQ Level DMA Channel

IRQ 3
IRQ 4 (default)
IRQ 5
IRQ 10
IRQ 11
IRQ 15

DMA 0
DMA 3

Subsystems 3-9

Enhanced Video Subsystem

The enhanced video subsystem consists of the following functions:

 Video acceleration (hardware scaling, interpolation, color space

conversion)
 Video overlay
 Video capture

1

 One video-in jack (NTSC or PAL

input)

 One video-out jack

 MPEG playback

Video Port Specification

 S-Video Jack (In/Out)

– 4-pin mini DIN jack (provided with attached special cable)
– Color standard: NTSC or PAL
– Y signal: 1 V pp 75 ohm with negative composite sync
– C signal: 0.286 V pp 75 ohm

 Composite Video Jack (In/Out)

– Pin jack (provided with attached special cable)
– Color standard: NTSC or PAL
– 1 V pp 75 ohm with negative composite sync

 Dolby surround

1

NTSC: National Television Standards Committee
PAL: Phase-alternation-by-line

3-10 Subsystems

PCMCIA Subsystem

The system board has two PCMCIA (Personal Computer Memory
Card International Association) slots that support the following types
of PC Card:

 16 bit PC Card Type–I, II, III 5V, 3.3V

 32 bit PC Card Type–I, II, III 5V, 3.3V

However, x.xV, y.yV, DMA, and ZV are not supported.
The maximum current allowable for both slots at the same time is:

 1.0 A at 5 V dc

 0.8 A at 3.3 V dc

 0.1 A at 12 V dc

2

The PCI1250 PCI-to-Cardbus Controller Unit

is used as the PC card
controller in the system unit. The available interrupt levels are IRQ
3, 4, 5, 7, 9, 10, 11, 14, and 15.

The system unit resumes operation from suspend mode when it
receives the ‘RI_OUT’ signal. The Type I and Type II PC cards can
be installed into either the upper or the lower slot, or into both slots
at the same time. The Type III PC card, however, must be installed
only in the lower slot. The Type II PC card cannot be used in the
upper slot when a Type III PC card is used.

The PCMCIA slots are designed according to the PC Card standard
made in February 1995.

2

Manufactured by Texas Instruments corporation.

Subsystems 3-11

Pin Assignments

Figure 3-3 shows the pin assignments for the PCMCIA slots.

Pin 16-Bit PC Card 32-Bit PC Card

1 Ground Ground
2D3 CAD0
3D4 CAD1
4D5 CAD3
5D6 CAD5
6D7 CAD7
7 CE1# CC/BE0#
8 A10 CAD9

9OE CAD11
10 A11 CAD12
11 A9 CAD14
12 A8 CC/BE1#
13 A13 CPAR
14 A14 CPERR#
15 WE# CGNT#
16 IRQ# CINT#
17 Vcc Vcc
18 Vpp Vpp
19 A16 CCLK
20 A15 CIRDY#
21 A12 CC/BE2#
22 A7 CAD18
23 A6 CAD20
24 A5 CAD21
25 A4 CAD22
26 A3 CAD23
27 A2 CAD24
28 A1 CAD25
29 A0 CAD26
30 D0 CAD27

Figure 3-3 (Part 1 of 2). PCMCIA PC Card Slot Pin Assignments

3-12 Subsystems

Pin 16-Bit PC Card 32-Bit PC Card

31 D1 CAD29
32 D2 Reserved
33 IOIS16# CCLKRUN#
34 Ground Ground
35 Ground Ground
36 CD1# CCD1#
37 D11 CAD2
38 D12 CAD4
39 D13 CAD6
40 D14 Reserved
41 D15 CAD8
42 CE2 CAD10
43 VS1# CVS1
44 IORD# CAD13
45 IOWR# CAD15
46 A17 CAD16
47 A18 Reserved
48 A19 CBLOCK#
49 A20 CSTOP#
50 A21 CDEVSEL#
51 Vcc Vcc
52 Vpp Vpp
53 A22 CTRDY#
54 A23 CFRAME#
55 A24 CAD17
56 A25 CAD19
57 AS2# CVS2
58 RESET CRST#
59 WAIT# CSERR#
60 INPACK# CREQ#
61 REG# CC/BE3#
62 SPKR# CAUDIO
63 STSCHG# CSTSCHG
64 D8 CAD28
65 D9 CAD30
66 D10 CAD31
67 CD2# CCD2#
68 GND GND

Figure 3-3 (Part 2 of 2). PCMCIA PC Card Slot Pin Assignments

The maximum current for +5 V dc is 1.0 A (including both slots and
V pp).

The maximum current for +12 V dc is 0.1 A (including both slots and
V pp). When the computer is in suspend mode, it requires a current
of 0.05 A.

Subsystems 3-13

IDE Channel on the UltraBay II

A primary IDE channel is provided on the UltraBay connector,
providing two system settings:

I/O Address IRQ Level

01F0–01F7
03F6

A secondary IDE channel is provided on the UltraBay connector,
providing two system settings:

I/O Address IRQ Level

0170–0177
0376

If a hard disk is attached to the hard disk connector, an IDE device
on the UltraBay becomes a primary slave. (The hard disk attached
to the hard disk connector is the primary master.) If no hard disk is
attached to the hard disk connector, an IDE device on the UltraBay
is a primary master.

IRQ 14

IRQ 15

MIDI/Joystick Port

The MIDI/joystick port consists of the following functions:

 MIDI port (in/out)

 Joystick port
A standard game port connector is provided with a MIDI/joystick

cable.

MIDI Interface

A MIDI communication function is provided with the DSP subsystem.
The MIDI interface is compatible with MPU-401 (UART mode).

Joystick Interface

A joystick interface is provided at I/O address 0201. You can select
whether to enable or disable it with the ThinkPad Features program.

3-14 Subsystems

Appendix A. System Resources

The following summarizes the available system resources for the
computer and docking stations. Values in parentheses are
alternative values that are selectable in the ThinkPad Configurations
program or application programs. The default values are highlighted.

System
Resource

Timer 0 0040–0043 None None
Keyboard 1 0060 and 0064 None None
Serial port Disabled Disabled None None

Parallel port 7 03BC–03BE

Infrared port 4, 3, or

Diskette
controller

Video
controller

IRQ I/O Address

4 03F8–03FF
3 02F8–02FF
4 03E8–03EF
3 02E8–02EF

7 0378–037F

5 0278–027F

Disabled Disabled

disabled

6 03F0–03F7 None 2

None 03BA,

(Hex)

(and
07BC–07BEñ)

(and
0778–077Añ)

(and
0678–067Añ)

03F8–03FF,
02F8–02FF,
02E8–02EF, or
03E8–03EF

03B4–03B5,
03C0–03CF,
03D4–03D5,
03D8–03D9,
03DA,
2100–21FF,
2200–2203,
2300–2323

Memory
Address (Hex)

None 0, 1, 3,

None 0 and 3

A0000–BFFFF
and
C0000–C9FFF

DMA
Channel

or
disabledò

or
disabled

None

 Copyright IBM Corp. 1997 A-1

System
Resource

Enhanced
video/MPEG
(for the
enhanced
video model)

(For models
with internal
modems only)
ThinkPad
modem

Sound blaster None 0220–022F,

MIDI 5, 7, 9,

Joystick port None 0201 None None
(For models

with internal
modems only)
ThinkPad
modem

WSS codec
base

Control base None 0538–053F,

Hard disk
drive, CD-ROM
drive (for the
CD-ROM drive
model), or hard
disk drive in
the UltraBay II

PCMCIA
controller

IRQ I/O Address

11, 3, 4,

5, 7, 9,
10, 15,
or
disabledó

10, 5, 7,
11, 15,
or
disabled

10, 11,
15, or
disabledõ

3 02F8–02FF None None
4 03F8–03FF
4 03E8–03EF
3 02E8–02EF
Disabled Disabled
5, 7, 9,

10, 11,
15

14 or
15ö

11 03E0–03E1

(Hex)

None (Automatically

0130–013F,
0350–035F,
0770–077F, or
0DB0–0DBF

0240–024F,
0260–0273, or
0280–0293

0330–0332,
0300–0302,
0310–0313, or
0320–0323

0530–0537,
0604–060B
0E80–0E87,
0F40–0F47

0D38–0D3F
0E88–0E8F,
0FF0–0FF7

01F0–01F7
and
03F6, or
0170–0177
and
0376

(the PC Card
slot in the
docking
station:
03E2–03E3)

Memory
Address (Hex)

set by the
system)ô

None 7, 0, 1,

None None

None None

None 0, 1, 3,

None None

None None

None None

DMA
Channel

None

or 6

A-2

System
Resource

PC Card (Dependent

Real time clock 8 0070–0071 None None
TrackPoint or

mouse
Math

coprocessor
exception

SCSI controller
SelectaDock III

The IDE hard
disk drive or
IDE CD-ROM
drive in the
docking station

The ISA
adapter card
(option card) in
the docking
station

IRQ I/O Address

on the
PC Card
type)

12 0060 and 0064 None None

13 None None None

11, 3, 4,
5, 7, 9,
10, 15,
or
disabled

15, 10,
11

(Refer to the manual that came with the adapter card.)

(Hex)

(Dependent on
the PC Card
type)

Automatically
set by the
system

0170–0177
and
0376,
01E0–01E7
and
03E6,
01E8–01EF
and
03EE, or
0168–016F
and
036E

Memory
Address (Hex)

(Dependent on
the PC Card
type)

None None

None None

DMA
Channel

None

A-3

System
Resource

The PCI
adapter card
(option card) in
the
SelectaDock

Note: Notes
ñ The I/O addresses in parentheses are also used when ECP is enabled as the

printer operating mode from the ThinkPad Configuration program.
ò When you enable ECP as the printer operating mode from the ThinkPad

Configuration program, you must select one value from the four selections
(including “disabled”).

ó The enhanced video features and the PCI adapter card in the SelectaDock
docking system share the same IRQ11.

ô The memory address higher than the system memory will be automatically set
by the system.

õ Sound Blaster and MIDI share the same IRQ.
ö IRQ 15 and I/O 0170–0177 and 0376 are applicable to the UltraBay II devices

only.

IRQ I/O Address

11, 3, 4,

5, 7, 9,
10, 15,
or
disabledñ

(Hex)

(Refer to manuals that came with the adapter
card.)

Memory
Address (Hex)

DMA
Channel

A-4

Appendix B. System Management API (SMAPI) BIOS Overview

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Header Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

Calling Convention . . . . . . . . . . . . . . . . . . . . . . . . . . B-6

Parameter Structure . . . . . . . . . . . . . . . . . . . . . . . B-6

Sample in Assembler Language ............... B-8

Sample in C Language .................... B-9

Calling Convention Pseudo Code ............... B-10

Return Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-11

Function Description . . . . . . . . . . . . . . . . . . . . . . . . B-12

System Information Service .................. B-12

Get System Identification .................. B-12

Get CPU Information .................... B-13

Get Display Device Information .............. B-14

Get Docking Station Information .............. B-15

Get UltraBay II Information ................. B-16

Get Slave Micro Control Unit Information ......... B-17

Get System Sensor Status ................. B-18

Get Video Information .................... B-19

Get Refresh Rate Capability ................ B-20

System Configuration Service ................. B-22

Get Display Device State .................. B-22

Set Display Device State .................. B-24

Get Pointing Device State .................. B-25

Set Pointing Device State .................. B-26

Get Hotkey Sticky/Lock ................... B-27

Set Hotkey Sticky/Lock ................... B-28

Power Management Service .................. B-29

Get Power Management Mode ............... B-29

Set Power Management Mode ............... B-30

Get Timer Control ...................... B-31

Set Timer Control ...................... B-33

Event Bit Definition ....................... B-34

Get System Event Global Condition ............ B-35

Set System Event Global Condition ............ B-36

Get System Event 1 Condition ............... B-37

Set System Event 1 Condition ............... B-38

Get System Event 2 Condition ............... B-39

Set System Event 2 Condition ............... B-40

Get System Timer ...................... B-41

Set System Timer ...................... B-42

 Copyright IBM Corp. 1997 B-1

Get Hibernation Timer .................... B-43

Set Hibernation Timer .................... B-44

Get System Event 3 Condition ............... B-45

Set System Event 3 Condition ............... B-46

Get System Resume Condition .............. B-47

Set System Resume Condition ............... B-48

Get System Resume Timer ................. B-49

Set System Resume Timer ................. B-50

Request System Standby .................. B-51

Request System Suspend ................. B-51

Request System Hibernation ................ B-52

Request System Off ..................... B-52

Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-53

Data Structure . . . . . . . . . . . . . . . . . . . . . . . . B-53

Function Declaration . . . . . . . . . . . . . . . . . . . . . . B-57

Installation Check . . . . . . . . . . . . . . . . . . . . . . . . B-58

BIOS Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-62

B-2 SMAPI BIOS

Overview

The ThinkPad Basic Input/Output System (BIOS) provides a special
software interface, called the System Management Application
Program Interface (SMAPI) BIOS, to control the following unique
features of the ThinkPad system:

System Information

This BIOS provides unique ThinkPad information, such as
the system identifier (system ID).

System Configuration

The ThinkPad SMAPI BIOS provides system configuration
control for such features as display device selection or
resource configuration for built-in devices.

Power Management

Through the SMAPI BIOS, the operating system or
application software can control the ThinkPad power
management features (the power mode or
suspend/hibernation/resume options).

“Header Image” on page B-4 describes how to use the SMAPI BIOS.

SMAPI BIOS B-3

Header Image

Systems that support SMAPI BIOS must provide the following header
image in the F000 segment system ROM area at the 16-byte
boundary. The client needs to search and find this SMAPI BIOS
header image to get the entry point for the service.

Field Offset

Signature 00 4 bytes '$SMB' (ASCII)
Version (Major) 04 Byte 01h
Version (Minor) 05 Byte 00h
Length 06 Byte 20h
Checksum 07 Byte –
Information Word 08 Word –
Reserved 1 0A Word –
Real mode 16-bit offset to entry

point
Real mode 16-bit code segment

address
Reserved 2 10 Word –
16-bit protected mode offset to

entry point
16-bit protected mode code

segment base address
32-bit protected mode offset to

entry point
32-bit protected mode code

segment base address

(in
Hex)

0C Word –

0E Word –

12 Word –

14 Double

18 Double

1C Double

Length Value

–

words

–

words

–

words

Signature ASCII Code '$SMB' is stored at the top of the header

image.

Version (Major or Minor)

Indicates the SMAPI BIOS version.

Length The length of the header image.
Checksum Checksum byte area. The client verifies that this

header image is valid by using this checksum; the client
should check all header image bytes, and the result will
be zero bytes.

B-4 SMAPI BIOS

Information Word

This area identifies the following BIOS service level:

Information Word

Bit ð : Real/V86 mode interface support
Bit 1 : 16-bit protected mode support
Bit 2 : 32-bit protected mode support
Bit 3-15 : Reserved

Real Mode Entry Point

The entry point is specified in segment, offset format.
Clients using Real/V86 mode can use this area for the
far-call value.

16-Bit or 32-Bit Protected Mode Entry Point

The code base code address specifies the physical
address for this BIOS, and the client must prepare the
selector for this BIOS. The length should be 64 KB.

SMAPI BIOS B-5

Calling Convention

The client can invoke the SMAPI BIOS with a far-call to the entry
point that is specified in the header file. All parameters for the BIOS
and other results are stored in the client data area; the client needs
to prepare an input parameter and output parameter area in its data
area, and informs this area by pushing those pointers onto its stack
before the far-calls.

The SMAPI BIOS uses the stack/data area directly with the selector
when the BIOS is invoked. Therefore, the caller needs to define the
same privilege level as the BIOS.

Parameter Structure

The memory allocation for the input/output field should be prepared
by the caller. The input field specifies the function request to the
SMAPI BIOS, and the BIOS fills in the return value to the output
field.

Input Field

Field Offset

(in Hex)

Major Function Number 00 Byte
Minor Function Number 01 Byte
Parameter 1 02 Word
Parameter 2 04 Word
Parameter 3 06 Word
Parameter 4 08 Double word
Parameter 5 0C Double word

Length

B-6 SMAPI BIOS

Output Field

Field Offset

(in Hex)

Return Code 00 Byte
Auxiliary Return Code 01 Byte
Parameter 1 02 Word
Parameter 2 04 Word
Parameter 3 06 Word
Parameter 4 08 Double word
Parameter 5 0C Double word

Length

SMAPI BIOS B-7

Sample in Assembler Language

;

; Input Parameter Structure
;
SMB_INPARM STRUC
@SMBIN_FUNC DB ?
@SMBIN_SUB_FUNC DB ?
@SMBIN_PARM_1 DW ?
@SMBIN_PARM_2 DW ?
@SMBIN_PARM_3 DW ?
@SMBIN_PARM_4 DD ?
@SMBIN_PARM_5 DD ?
SMB_INPARM ENDS

;

; Output Parameter Structure
;

SMB_OUTPARM STRUC
@SMBOUT_RC DB ?
@SMBOUT_SUB_RC DB ?
@SMBOUT_PARM_1 DW ?
@SMBOUT_PARM_2 DW ?
@SMBOUT_PARM_3 DW ?
@SMBOUT_PARM_4 DD ?
@SMBOUT_PARM_5 DD ?
SMB_OUTPARM ENDS

B-8 SMAPI BIOS

Sample in C Language

//

// Input Parameter Structure

//

typedef struct {

BYTE SMBIN_FUNC ;
BYTE SMBIN_SUB_FUNC ;
WORD SMBIN_PARM_1 ;
WORD SMBIN_PARM_2 ;
WORD SMBIN_PARM_3 ;
DWORD SMBIN_PARM_4 ;
DWORD SMBIN_PARM_5 ;

} INPARM, \PINPARM ;

//

// Output Parameter Structure

//

typedef struct {
BYTE SMBOUT_RC ;
BYTE SMBOUT_SUB_RC ;
WORD SMBOUT_PARM_1 ;
WORD SMBOUT_PARM_2 ;
WORD SMBOUT_PARM_3 ;
DWORD SMBOUT_PARM_4 ;
DWORD SMBOUT_PARM_5 ;

} OUTPARM, \POUTPARM ;

typedef INPARM far \ FPINPARM ;

typedef OUTPARM far \ FPOUTPARM ;

SMAPI BIOS B-9

Calling Convention Pseudo Code

The following describes the calling convention using pseudo code.

Assembler Language

InputParm SMB_INPARM < >
OutputParm SMB_OUTPARM < >

16-bit

push ds

mov ax, offset OutputParm
push ax
push ds

mov ax, offset InputParm
push ax

call dword ptr SmapiBios
add sp, 8

32-bit
push ds

mov eax, offset OutputParm
push eax
push ds

mov eax, offset InputParm
push eax

call fword ptr SmapiBios
add sp, 16

C Language

typedef WORD (far \ SMB)(FPINPARM, FPOUTPARM) ;

SMB SmapiBios ;
INPARM InputParm ;
OUTPARM OutputParm ;
WORD RC ;

RC = SmapiBios(&InputParm, &OutputParm) ;

B-10 SMAPI BIOS

Return Codes

The following hexadecimal return codes are stored in both the AL
(AX) register and the return code field of the output parameter:

ðð No error
53 SMAPI function is not available
81 Invalid parameter
86 Function is not supported
9ð System error
91 System is invalid
92 System is busy
Að Device error (disk read error)
A1 Device is busy
A2 Device is not attached
A3 Device is disabled
A4 Request parameter is out of range
A5 Request parameter is not accepted

All other values are reserved.

SMAPI BIOS B-11

Function Description

System Information Service

Get System Identification

Input Field

Major Function Number - ðð
Minor Function Number - ðð
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Return value format

= ðð - ASCII format

= ð1 - Binary format
Parameter 1 - System ID
Parameter 2 - Country Code
Parameter 3 - System BIOS revision
Parameter 4 - (Bits 31-16) Reserved

- (Bits 15-ð) System Management BIOS revision

Parameter 5 - (Bits 31-16) Reserved

- (Bits 15-ð) SMAPI BIOS Interface revision

B-12 SMAPI BIOS

Get CPU Information

Input Field

Major Function Number - ðð
Minor Function Number - ð1
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - Reserved
Parameter 2 - CPU ID

(Bits 15-8) Microprocessor type
(Bits 7-ð) Microprocessor stepping level
= FFFFh : Unknown

Parameter 3 - Clock Information

(Bits 15-8) CPU clock (units: MHz)
= FEh : CPU clock is over 254 MHz
= FFh : Unknown
(parameter 4 is valid)
(Bits 7-ð) Internal clock (units: MHz)
= FEh : Internal clock is over 254 MHz
= FFh : Unknown
(parameter 5 is valid)

Parameter 4 - (Bits 31-16) Reserved

- (Bits 15-ð) CPU clock (units : MHz)

Parameter 5 - (Bits 31-16) Reserved

- (Bits 15-ð) Internal clock (units: MHz)

SMAPI BIOS B-13

Get Display Device Information

Input Field

Major Function Number - ðð
Minor Function Number - ð2
Parameter 1 - (Bit 8) LCD information

(Bit 9) External CRT information

(Bits 15-1ð) Reserved

(Bits 7-ð) Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - (Bits 15-8)

Built-in display device (panel)
information 1

= ðð : Monochrome STN LCD

= ð1 : Monochrome TFT LCD

= ð2 : Color STN LCD

= ð3 : Color TFT LCD

= FF : Unknown
(Bits 7-ð)

Built-in display device (panel)
information 2

= ðð : 64ðx48ð

= ð1 : 8ððx6ðð

= ð2 : 1ð24x768

= FF : Unknown
Parameter 2 - (Bits 15-8) External CRT monitor
information

= ðð : External CRT is not attached

= 1ð : Color monitor

= 2ð : Monochrome monitor

= FF : Unknown

(Bits 7-ð) Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

B-14 SMAPI BIOS

Get Docking Station Information

Input Field

Major Function Number - ðð
Minor Function Number - ð3
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Docking station status

Bit ð - Docking status
= ð : Undock
= 1 : Dock
Bits 5-1 - Reserved
Bit 6 - Security key status
= ð : Lock position
= 1 : Unlock position
Bit 7 - Bus status
= ð : BUS isolated

= 1 : BUS connected
Parameter 1 - Docking station ID
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

SMAPI BIOS B-15

Get UltraBay II Information

Input Field

Major Function Number - ðð
Minor Function Number - ð4
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - Reserved
Parameter 2 - (Bits 15-8) UltraBay device information

= ðð : FDD
= ð1 : Serial device
= ð2 : TV tuner
= 1ð : IDE device
= 2ð : PCMCIA adapter
= 3ð : Battery
= 4ð : AC adapter
= FE : No UltraBay
= FF : Unknown
(Bit 7-ð) UltraBay device ID
= ðð : FDD
= ð1 : Cellular
= ð2 : TV tuner
= 1ð : CD-ROM
= 11 : IDE-HDD
= 12 : DVD
= 13 : ZIP

= FF : ID is not available
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

B-16 SMAPI BIOS

Get Slave Micro Control Unit Information

Input Field

Major Function Number - ðð
Minor Function Number - ð6
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Return value format

= ðð - ASCII format

= ð1 - Binary format
Parameter 1 - Reserved
Parameter 2 - Slave controller Revision

(= ðFFFF) - Not valid
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

SMAPI BIOS B-17

Get System Sensor Status

Input Field

Major Function Number - ðð
Minor Function Number - ð7
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - Reserved
Parameter 2 - Current Status

Bit 8 - LID Status

= ð : Open
= 1 : Close

Bit 9 - Keyboard status

= ð : Close
= 1 : Open

Bit 1ð- AC Adapter

= ð : Not attached

= 1 : Attached
Bits 15-11 : Reserved
Bits 7-ð : Reserved

Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

B-18 SMAPI BIOS

Get Video Information

Input Field

Major Function Number - ðð
Minor Function Number - ð8
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - Video BIOS revision
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

SMAPI BIOS B-19

Get Refresh Rate Capability

Input Field

Major Function Number - ðð
Minor Function Number - ð9
Parameter 1 - mode

= ððxxh - VGA modes
(Bits ð-7 are ignored)
= ð1ðð - 64ðx4ððx256
= ð1ð1 - 64ðx48ðx256
= ð1ð2 - 8ððx6ððx16
= ð1ð3 - 8ððx6ððx256
= ð1ð4 - 1ð24x768x16
= ð1ð5 - 1ð24x768x256
= ð1ð6 - 128ðx1ð24x16
= ð1ð7 - 128ðx1ð24x256
= ð1ð9 - 1ð56x35ðx16
= ð1ðA - 1ð56x473x16
= ð1ðC - 1ð56x48ðx16
= ð11ð - 64ðx48ðx32K
= ð111 - 64ðx48ðx64K
= ð112 - 64ðx48ðx16M
= ð113 - 8ððx6ððx32K
= ð114 - 8ððx6ððx64K
= ð115 - 8ððx6ððx16M
= ð116 - 1ð24x768x32K
= ð117 - 1ð24x768x64K
= ð118 - 1ð24x768x16M
= ð119 - 128ðx1ð24x32K
= ð11A - 128ðx1ð24x64K
= ð11B - 128ðx1ð24x16M
= ðAðð - 16ððx12ððx16
= ðAð1 - 16ððx12ððx256
= ðAð2 - 16ððx12ððx32K
= ðAð3 - 16ððx12ððx64K
= ðAð4 - 16ððx12ððx16M

= Others : Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

Output Field

B-20 SMAPI BIOS

Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - Reserved
Parameter 2 - Refresh rate capability for
specified mode:

Bit ð - 6ðHz available
Bit 1 - 72Hz available
Bit 2 - 75Hz available
Bit 3 - 43Hz(I) available
Bit 4 - 56Hz available
Bit 5 - 7ðHz available
Bit 6 - 85Hz available
Bit 7 - 48Hz(I) available

Bits 8-15 : Reserved (must be B'ð')
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

SMAPI BIOS B-21

System Configuration Service

Get Display Device State

Input Field

Major Function Number - 1ð
Minor Function Number - ðð
Parameter 1 - Request type

= ððððh : Current hardware
= ððð1h : CMOS

(effective after reboot)
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

B-22 SMAPI BIOS

Output Field

Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - Bits 15-8 : Reserved

Bits 7-ð : Capability of display device function
Bit ð - Display function type

= ð : Not support
= 1 : Support

Bits 7-1 : Reserved

Parameter 2 - Bits 15-8 Display current status

Bit ð - Built-in display (panel) status

= ð : Disable
= 1 : Enable

Bit 1 - External CRT status

= ð : Disable
= 1 : Enable

Bit 2 - TV status

= ð : Disable

= 1 : Enable
Bits 6-3 : Reserved
Bit 7 - Dual enable flag

= ð : Disable

= 1 : Enable
Bits 7-ð : Display function type

= ððh : No TV-out model

= ð1h : Not support model for simultaneous

display of TV and CRT
Parameter 3 - Reserved
Parameter 4 - When parameter 2 (bits 7-ð) is ð1h:

Bits 31-16 : Reserved
Bits 15-ð : Display selection mode
Bit ð - Display selection mode

= ð : LCD - CRT selection mode
= 1 : LCD - TV selection mode

Bits 7-1 : Reserved

Parameter 5 - Reserved

SMAPI BIOS B-23

Set Display Device State

Input Field

Major Function Number - 1ð
Minor Function Number - ð1
Parameter 1 - Request display status

Bit ð - Built-in display (panel) status

= ð : Disable
= 1 : Enable

Bit 1 - External CRT status

= ð : Disable
= 1 : Enable

Bit 2 - TV status

= ð : Disable

= 1 : Enable
Bits 5-3 : Reserved
Bit 6 - Monitor detection ignore

= ð : Do not ignore

= 1 : Ignore
Bit 7 - Dual enable flag

= ð : Disable

= 1 : Enable

Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - When parameter 2 (bits 7-ð) is ð1h in return

of “Get Display Device State”:
Bits 31-16 : Reserved
Bits 15-ð : Display selection mode
Bit ð - Display selection mode

= ð : LCD - CRT selection mode

= 1 : LCD - TV selection mode
Bits 7-1 : Reserved

Parameter 5 - Reserved

Output Field

Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved

B-24 SMAPI BIOS