ICS Computers C3SX, C4DX User Manual

Product Manual

MANUAL NO. 8701027

Revision L

SB486T2C/66

SB486TC/50
SB486TC/33

SB486SXTC/33

SB386SX/25

9950 Barnes Canyon Road, San Diego, CA 92121 [phone] (FAX) 619-67 7-0895

INDUSTRIAL COMPUTER SOURCE EUROPE TEL [phone] FAX [phone]

INDUSTRIAL COMPUTER SOURCE (UK) LTD TEL [phone] FAX [phone]

Product Manual

MANUAL NO. 8701027

Revision L

SB486T2C/66

SB486TC/50
SB486TC/33

SB486SXTC/33

SB386SX/25

9950 Barnes Canyon Road, San Diego, CA 92121 [phone] (FAX) 619-67 7-0895

INDUSTRIAL COMPUTER SOURCE EUROPE TEL [phone] FAX [phone]

INDUSTRIAL COMPUTER SOURCE (UK) LTD TEL [phone] FAX [phone]

This page intentionally left blank.

INDUSTRIAL COMPUTER SOURCE

GUARANTEE, LIMITED WARRANTY AND RETURN POLICY

* LIMITED WARRANTY: One year limited warra nt y on al l products sold
with the exception of the "Performance Series" I/O products, which are war­ranted to the original purchaser for as long as they own the product, subject
to all other conditions below, including those regarding neglect, misuse and
acts of God. Withi n one year of purchase, we will repair or replace , a t our
option, any defe ct ive product sold by us. At any t ime a fte r one year, we
will repair or replace, at our option, any defective "Performance Series" I/O
product sold by us . Thi s does not include prod uct s damaged in shipment, or
damaged through customer neglect or misuse.

The Return Procedure below must be followed to assure repair or re­placement. We will norm ally return your replacement or repaire d it em
via UPS Blue. Overnight delivery or de li very via other carriers is avail­able at additional charge.

The limited warranty is void if the product has been subjected to altera­tion, neglect, misuse, or abuse; if any repairs have been attempted by
anyone other than Industrial Computer Source or its authorized agent;
or if the failure is caused by accident, acts of God, or other causes
beyond the control of Industrial Com puter Source or the ma nufa ct urer.
Neglect, misuse, and abuse shall include any installation, operation, or
maintenance of the product other than in accordance with the owners’
manual.

No agent, dealer, distributor, service company, or other party is
authorized to change, modify, or extend the terms of this Limited War­ranty in any manner w hatsoever. Indust ria l Computer Source reserves
the right to make changes or improvements in any product without in­curring any obligation to similarly alter products previously purchased.

* GUARANTEE: Thirty day money- back gua rantee on all standard
products sol d. Speci al order products are co ver ed by our Limited Warra nty,
however they may not be returned for refund or credit.

REFUNDS: In order to recei ve a ful l re fund of product purcha s e
price, the product must not have been damaged by the customer or by
the common carrier chosen by the customer to return the goods, and the
product must be returned complete (meaning all manuals, software,
cables, etc.) within 30 days of receipt and in as-new and resalable con-

TECHNICAL REFERENCE

dition. RETURN P ROCEDURE below must be followed to assure
prompt refund.

RESTOCKING CHARGES: Product returns after 30 days, and
before 90 days, after purchase will be subject to a minimum 20% res­tocking charge and any charges for damaged or missing parts.

Products not returned within 90 days of purchase, or products
which are not in as-new and resalable condition, are not eligible
for credit return and will be returned to the customer.

RETURN PROCEDURE: For any Limited Wa rra nty or Guarantee return,
every product returned to Industrial Computer Source for service or credit
must be accompanied by a Return Material Authorization (RMA) Number,
obtained from Industrial Computer Source Customer Service, (800) 480-
0044, prior to its return. Freight on all returned items must be prepaid by
the customer and customer is responsible for any loss or damage caused by
common carrier in transit. Returns for warranty must include a failure
report for each unit by serial number, as well as a copy of the original in­voice showing date of purchase.

To reduce risk of damage, returns of product must be in an Industrial
Computer Sourc e shipping container. If the original conta iner has been
lost or damaged, new shipping containers may be obtained from In­dustrial Computer Source Customer Service at a nominal cost.

SHIPMENTS NOT IN COMPLIANCE WITH THIS GUARANTEE

AND LIMITED WARRANTY RETURN POLICY WILL NOT

BE ACCEPTED BY INDUSTRIAL COMPUTER SOURCE

LIMITATION OF LIABILITY: In no event shall Industrial Comput er

Source be liable for any defect in hardware or software or loss or inade­quacy of data of any kind, or for any direct, indirect, incidental, or conse­quential damages in connection with or arising out of the performance or
use of any produ ct furni s hed hereunder. Indus trial Computer Source
liability shall in no event exceed the purchase price of the product pur­chased hereunder. The foregoing li mi ta ti on of liability shall be e qua ll y ap­plicable to any service provided by Industrial Computer Source or its
authorized agent.

* Some sale items and custom systems are not subject to the
guarantee and limited warranty above, however in these instances
any deviations will be disclosed prior to sale and noted on the
original invoice. W e reserve the right to refuse returns or refunds
on software or special order items.

TECHNICAL REFERENCE

FOREWORD

This instruction manual provides the necessary user information for the ref­erenced product(s) manufactured or distributed by Industrial Computer
Source for the user to install, oper at e an d/or program the product properly.
Please refer to the preceding pages for information regarding the warranty
and repair policies.

Technical assistance is available at [phone].

Manual Errors, Omissions and Bugs: A Bug Sheet is includ ed as the last
page of this manua l. Plea s e use it if you find a proble m with the manual
you believe should be corrected.

NOTICE

The informati on i n this document is pro vided for reference onl y. Indus trial
Computer Source does not assume any liability arising out of the applica­tion or use of the information or products described herein. This documen t
may contain or reference information and products protected by copyrights
or patents and does not convey any license under the patent rights of In­dustrial Computer Source, nor the rights of others.

Printed in the U.S . A . Copyright 1996 by Indu strial Computer Source, a
California corporation, 9950 Barnes Canyon Road, Sa n Die go, CA 92121.
All rights reserved.

TECHNICAL REFERENCE

TRADEMARKS

IBM, PC/AT, VGA, EGA and PS/2 are trademarks of
Internatio na l Business Ma chines Corp .
AMI and AMIBIOS are trademarks of American Megatrends Inc.
Intel, 486, 386, DX and SX are trademarks of Intel Corporation
MS-DOS and Microsoft are trademarks of Microsoft Corp.
All other brand and product names are trademarks or registered
trademarks of their respective companies.

LIABILITY DISCLAIMER

This manual is as complete and factual as possible at the time of
printing; however, the information in this manual may have been up­dated since tha t time. Industr ia l Computer So ur ce r eserves the right
to change the functions, features, or specifications of their products
at any time, without notice.

TECHNICAL REFERENCE

TABLE OF CONTENTS

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

SB486T2C/66, SB486TC/50, S B486TC/33

and SB486SXTC/33 (C4DX)

Model Numbers . . . . . . 1-C4DX-1

Features . . . . . . . . . . . . 1-C4DX-1

Processor Block Diagram . 1-C4DX-3
Processor Board Layout . . . 1-C4DX-4

Processor . . . . . . . . . . . 1-C4DX-5

CPU Clock . . . . . . . . . . 1-C4DX-5

Bus Speed . . . . . . . . . . . 1-C4DX-5

On-Board Features . . . . . . 1-C4DX-5

RAM Memory . . . . . . . . 1-C4DX-6

ROM Memory . . . . . . . . 1-C4DX-7

Performance . . . . . . . . . 1-C4DX-7

Power Requirements . . . . . 1-C4DX-7

Environment . . . . . . . . . 1-C4DX-7

Configuration Jumpers . . . . 1-C4DX-8

System BIOS . . . . . . . . . 1-C4DX-9

Watchdog Timer . . . . 1-C4DX-10

Connectors . . . . . . . . 1-C4DX-11

SB386SX/25 (C3SX)

Model Number . . . . . . . . 1-C3SX-1

Features . . . . . . . . . . . . 1-C3SX-1

Processor Block Diagram . 1-C3SX-3
Processor Board Layout . . . 1-C3SX-4

Processor . . . . . . . . . . . 1-C3SX-5

CPU Clock . . . . . . . . . . 1-C3SX-5

Bus Speed . . . . . . . . . . . 1-C3SX-5

On-Board Features . . . . . . 1-C3SX-5

TECHNICAL REFERENCE

TABLE OF CONTENTS

Specifications

(continued)

RAM Memory . . . . . . . . . 1-C3SX-5

ROM Memory . . . . . . . . . 1-C3SX-6

Performance . . . . . . . . . . 1-C3SX-6

Power Requirements . . . . . 1-C3SX-7

Environment . . . . . . . . . . 1-C3SX-7

Configuration Jumpers . . . . 1-C3SX-8

System BIOS . . . . . . . . . 1-C3SX-9

Watchdog Timer . . . . . . . . 1-C3SX-9

Connectors . . . . . . . . . . 1-C3SX-11

ISA Reference . . . . . . . . . . . . . . . . . 2-1

ISA Bus . . . . . . . . . . . . . . . .2-1

I/O Address Map . . . . . . . . . .2-8

Interrupt Assignments . . . . . . . . .2-8

System BIOS . . . . . . . . . . . . . . . . . . . 3-1

BIOS Operation . . . . . . . . . . . .3-1

Password Entry . . . . . . . . . .3-3

BIOS Errors . . . . . . . . . .3-5

Running the CMOS Setup Programs .3-7

BIOS Setup Menu . . . . . . . . . .3-8

Change Password . . . . . . . . . 3-13

Auto Detect Hard Disk . . . . . . . 3-15

Key Conventions . . . . . . . . . 3-18

Standard CMOS Setup/Drive Types . . . . . . 4-1

TECHNICAL REFERENCE

TABLE OF CONTENTS

Advanced Setup . . . . . . . . . . . . . . . . . .5-1

SB486T2C/66, SB486TC/50, S B486TC/33

and SB486SXTC/33 (C4DX)

Advanced CMOS Setup . . . 5-C4DX-1
Advanced Chip Set Setup 5-C4DX-11

SB386SX/25 (C3SX)

Advanced CMOS Setup . . . 5-C3SX-1
Advanced Chip Set Setup . 5-C3SX-9

Peripheral Management Setup . . . . . . . . .6-1

Appendix A - BIOS Messages . . . . . . . . A-1

TECHNICAL REFERENCE

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TECHNICAL REFERENCE

SPECIFICATIONS

SPECIFICATIONS

This section contains features and technical data for each of the
processor board s. The inf or mation is segmen te d into individ ua l se c ­tions for each processor board.

Each section contains information about the following:

• Model Numbers

• Features

• Block Diagram

• Board Layout

• Electrical

• Environmental

• Switches/Jumpers

• Connectors

TECHNICAL REFERENCE 1-1

SPECIFICATIONS

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1-2 TECHNICAL REFERENCE

SPECIFICATIONS

INTRODUCTION - SB486T2C/66, SB486TC/50, SB486TC/33 and
SB486SXTC/33

The SB486T2C/66, SB486TC/50 and SB486TC/33 (C4DX) and the
SB486SXTC/33 full-featured ISA processors are single board com­puters which feature CPU, DRAM, floppy controller, IDE interface,
two serial ports, parallel port, cache, upgrade socket, speaker port
and keyboard po rt on a single ISA card. These single-slot, high per­formance processors plug into ISA Bus passive backplanes and
provide 100% PC/AT compatibility for the system expansion slots.

MODEL NUMBERS

SB486T2C/66 486DX2 CPU at 66MHz with cache
SB486TC/50 486DX CPU at 50MHz with cache
SB486TC/33 486DX CPU at 33MHz with cache
SB486SXTC/33 486SX CPU at 33MHz with cache

FEATURES

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4
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• 80486DX2 microprocessor at 66MHz, or 80486DX

microprocessor at 50MHz or 33MHz, or 80486SX
microprocessor at 33MHz, each with 8KB Internal Cache
Memory

• 128KB External Cache Memory

• Intel upgrade socket for next generation CPU upgrades

• Two serial ports and one parallel port

• Floppy drive and IDE drive interface

• Automatic or Manual Peripheral Configuration

• Supports up to 32MB of DRAM on-board in two 32-bit wide

DRAM banks

• Supports 256K x 9, 1MB x 9 and 4MB x 9 SIMM’s

TECHNICAL REFERENCE 1-C4DX-1

SPECIFICATIONS

FEATURES (continued)

C

4
D
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• Shadow RAM for System BIOS and peripherals increases

system speed and performance

• Selectable bus speed

• Watchdog timer

• On-board battery

• Enhanced ISA Bus drive capability to support 20-slot back-

planes

• 64KB user EPROM space available

• Full PC/AT compatibility

• OPTI chip set

1-C4DX-2 TECHNICAL REFERENCE

CACHE

8042

EPROM

SPECIFICATIONS

Keyboard Conn.

C

4
D
X

80486

UPGRADE

SOCKET

D 0-31

Data Buffer

82C495

A 2-31

82C206

Integrated

Peripheral

82C392

Controller

TAG

System

Controller

Controller

MD0-31

MA0-10

XA0-15

XD0-7

DRAM

SA0-19

LA17-23

SD0-15

ISA
BUS

Parallel

711

Serial (2)

IDE

Floppy

TECHNICAL REFERENCE 1-C4DX-3

SPECIFICATIONS

C

4
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0
1

BANK

SIMMs

Battery

Battery Enable

External Battery

P1

ISA BUS

36 PIN

ISA BUS

62 PIN

JP11-ParallelJP9-Serial 1 Interrupt

Interrupt

CACHE

JP1-Watchdog

Timer

JP10-Serial 2 Interrupt

JP7-Floppy Precomp

JP8-Floppy Type

BIOS

486

Overdrive

Socket

P5-Speaker

JP6-

P3-Floppy

P12-IDE LED

P11-IDE

P10-Reset

P2-Keylock

P4
Keyboard

P7-Serial 2

JP3-Password

Serial 1

P6

1-C4DX-4 TECHNICAL REFERENCE

Parallel

P8

JP2-CRT Type

Clear

SPECIFICATIONS

PROCESSOR

• 80486DX2 at 66MHz operation

• 80486DX at 50MHz or 33MHz operation

• 80486SX at 33MHz operation

CPU CLOCK

• 486DX2/66 - 33MHz

• 486DX/50 - 50MHz

• 486DX/33 - 33MHz

• 486SX/33 - 33MHz

BUS SPEED

• 8.25MHz default for 66MHz or 33MHz, selectable through

BIOS Setup

• 8.33MHz default for 50MHz, selectable through BIOS Setup

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ON-BOARD FEATURES

• Speaker port

• Keyboard port

• Keylock port

• Floppy disk c ontroller supports two floppy driv es . Drives

can be 3-1/2" or 5-1/4" or one of each.

• Two serial ports

• Parallel printer port - bidirectional

• IDE interface supports two integrated drive electronics hard

drives

• On-board battery

TECHNICAL REFERENCE 1-C4DX-5

SPECIFICATIONS

RAM MEMORY - 1 MB to 32 MB

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Processor Board RAM Memory:

• 1MB to 32MB memory on processor board

• 1MB - 4 256K x 9 SIMM’s

• 2MB - 8 256K x 9 SIMM’s

• 4MB - 4 1MB x 9 SIMM’s

• 5MB - 4 256K x 9 SIMM’s (Bank 0) and 4 1MB x 9

SIMM’s (Bank 1)

• 8MB - 8 1MB x 9 SIMM’s

• 16MB - 4 4MB x 9 SIMM’s

• 20MB - 4 1MB x 9 SIMM’s (Bank 0) and

4 4MB x 9 SIMM’s (Bank 1)

• 32MB - 8 4MB x 9 SIMM’s

NOTE: Four SIMM’s of the same memory capacity must be
used to fill a m emo r y ba nk. For memory configurations requir­ing only four SIMM’s, the SIMM’s must be in Bank 0 (U40­U43).

• RAM Speed

• 66MHz < 80 nanoseconds

• 50MHz < 80 nanoseconds (CAS access must be

< 25 nanoseconds)

• 33MHz < 80 nanoseconds

• < 60 nanoseconds without external cache

1-C4DX-6 TECHNICAL REFERENCE

SPECIFICATIONS

ROM MEMORY

• BIOS ROM memory on the pr oc es sor boa r d is 1 27C512

(64K x 8), 64KB user EPROM space available with optional
27C1001 (128K x 8)

PERFORMANCE

• Norton SI Version 6.0

• 66MHz - 132.0

• 50MHz - 107.9

• 33MHz - 72.1

POWER REQUIREMENTS

Voltage:

+5V @ 2.7 Amps typical (33MHz processor with cache)
+12V @ < 100 mAmps typical

-12V @ < 100 mAmps typical

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ENVIRONMENT

Operating Temperature: 0° C to 60° C.
Storage Temperature: -20° C to 70° C.

Humidity Maximum: 90% non-condensin g

TECHNICAL REFERENCE 1-C4DX-7

SPECIFICATIONS

CONFIGURATION JUMPERS

C

4

The setup of the configuration jumpers on the processor is described

D

below. * indic a te s the default va lue of each jump er.

X

NOTE: For two-position ju mpers (3-post) , "RIGHT" is towa r d the
bracket end of the board; "LEFT" is toward the memory sockets.

Jumper Description
JP1 Watchdog Timer

Install on the LEFT to enable watchdog timer
operation.
Install on the RIGHT for normal reset operation. *

JP2 CRT Type Select

Install for a color CRT. *
Remove for a monochrome CRT.

JP3 Password Clear

Install for one power-up cycle to reset the password to

the default (null password).

Remove for normal operation. *

JP6 Battery Enable

Install on the LEFT to use the on-board battery. *
Install on the RIGHT to use an external battery.

JP7 Floppy Prec ompensation S el ect

Install for normal. *
Remove for alternate.

JP8 Floppy Drive Type Select

Install for dual speed drives.
Remove for single speed drives. *

1-C4DX-8 TECHNICAL REFERENCE

SPECIFICATIONS

CONFIGURATION JUMPERS (continued)

Jumper Description
JP9 On-Board Serial Port 1 Inter ru p t S e lect

Install on the TOP for IRQ4. *
Install on the BOTTOM for IRQ3.

JP10 On-Board Serial Port 2 Interrupt Select

Install on the TOP for IRQ4.
Install on the BOTTOM for IRQ3. *

JP11 On-Board Parallel Port 1 Interrupt Select

Install on the TOP for IRQ7. *
Install on the BOTTOM for IRQ5.

SYSTEM BIOS

The System BIOS is an AMI Hi-Flex BIOS with ROM-resident
setup utilities. The foll owing Setup util ities are sel ectable from the
main BIOS Setup Menu:

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• Standard CMOS Setup

• Advanced CMOS Setup

• Advanced Chip Set Setup

• Peripheral Management Setup

• Auto Configuration with BIOS Defaults

• Change Password

• Auto Detect Hard Disk

TECHNICAL REFERENCE 1-C4DX-9

SPECIFICATIONS

WATCHDOG TIMER

C

4

The watchdog timer is a hardware timer that resets the processor

D

board if the timer is not refreshed by software periodically. The

X

timer is typically used to restart an application which becomes hung
on an external e ve nt. When the applic a tion is hung, it can no longer
refresh the t imer. The watchd og timer then times out and rese ts the
processor board.

The watchdog tim e r has two levels of enable. First, th e watc hdog
timer jumper must be moved to the "enabled" position, which puts
the watchdog timer under softwar e control. Second, use r-supplied
software must start the watchdog timer via Keyboard Controller
(8042) Port 2, bit 3 (P23). P23 is set high from reset. Set ti ng P23
low starts the wat ch dog timer timeout of 1.2 seconds (nom inal).
Before the end of the timeout , P23 must be toggled high then low to
restart the timeout. If P 23 is left low un til the end of th e t imeout, th e
watchdog timer issues a hardware reset to the processor board. The
timer should be refreshed by the software every 1.0 seconds to
prevent a timeout.

A set of watchdog timer software is available from Technical Sup­port. The software includes sample C code which can be embedded
in a user program and demo software to demonstrate and test the
watchdog timer.

1-C4DX-10 TECHNICAL REFERENCE

SPECIFICATIONS

CONNECTORS

NOTE: Pin 1 on the connectors is indi cated by the square pad on

the PCB.

P1 - External Battery Connector for CMOS Memory

3 pin single row header, Amp #640456-3

PIN SIGNAL
1 Positive
2NC
3 Negative

P2 - Keylock Connector

5 pin single row header, Amp #640456-5

PIN SIGNAL
1 LED Power
2 Key
3 Gnd
4 Keylock Data
5 Gnd

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P3 - Floppy Drive Connector

34 pin dual row header, Molex #10-89-1341

PIN SIGNAL PIN SIGNAL
1 Gnd 2 N-RPM
3 Gnd 4 NC
5 Gnd 6 NC
7 Gnd 8 P-Index
9 Gnd 10 N-Motoron 1
11 Gnd 12 N-Drive Sel2
13 Gnd 14 N-Drive Sel1
15 Gnd 16 N-Motoron 2
17 Gnd 18 N-Dir
19 Gnd 20 N-Stop Step

TECHNICAL REFERENCE 1-C4DX-11

SPECIFICATIONS

P3 - Floppy Drive Connector (continued)

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PIN SIGNAL PIN SIGNAL
21 Gnd 22 N-Write Data
23 Gnd 24 N-Write Gate
25 Gnd 26 P-Track 0
27 Gnd 28 P-Write Protect
29 Gnd 30 N-Read Data
31 Gnd 32 N-Side Select
33 Gnd 34 Disk Chng

P4 - Keyboard Connector

5 pin single row header, Amp #640456-5

PIN SIGNAL
1 Kbd Clock
2 Kbd Data
3 Key
4 Kbd Gnd
5 Kbd Power (+5V fused)

P5 - Speaker Port Connector

4 pin single row header, Amp #640456-4
PIN SIGNAL

1 Speaker Data
2 Key
3 Gnd
4 +5V

P6 - Serial Port 1 Connector

9 pin D, Amp #747840-3

PIN SIGNAL PIN SIGNAL
1 Carrier Detect 6 Data Set Ready-I
2 Receive Data-I 7 Request to Send-O
3 Transmit Data-O 8 Clear to Send-I
4 Data Terminal Ready-O 9 Ring Indi cat or -I
5 Signal Gnd

1-C4DX-12 TECHNICAL REFERENCE

SPECIFICATIONS

P7 - Serial Port 2 Connector

10 pin dual row header, Molex #10-89-1101

PIN SIGNAL PIN SIGNAL
1 Carrier Detect 2 Data Set Ready-I
3 Receive Data-I 4 Request to Send-O
5 Transmit Data-O 6 Clear to Send-I
7 Data Terminal Ready-O 8 Ring Indi cat or -I
9 Signal Gnd 10 NC

P8 - Parallel Port Connector

25 pin D, Amp #747846-3

PIN SIGNAL PIN SIGNAL
1 Strobe 14 Auto Feed XT
2 Data Bit 0 15 Error
3 Data Bit 1 16 Init
4 Data Bit 2 17 Slct In
5 Data Bit 3 18 Gnd
6 Data Bit 4 19 Gnd
7 Data Bit 5 20 Gnd
8 Data Bit 6 21 Gnd
9 Data Bit 7 22 Gnd
10 ACK 23 Gnd
11 Busy 24 Gnd
12 Paper End 25 Gnd
13 Slct

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P10 - Exter na l Re se t Conn e ctor

2 pin header, Amp #640456-2

PIN SIGNAL
1 Negative External Reset
2 Gnd

TECHNICAL REFERENCE 1-C4DX-13

SPECIFICATIONS

P11 - IDE Hard Driv e Conn e ctor

C

4
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40 pin dual row header, Molex #10-89-1401

PIN SIGNAL PIN SIGNAL
1 Reset 2 Gnd
3 Data 7 4 Data 8
5 Data 6 6 Data 9
7 Data 5 8 Data 10
9 Data 4 10 Data 11
11 Data 3 12 Data 12
13 Data 2 14 Data 13
15 Data 1 16 Data 14
17 Data 0 18 Data 15
19 Gnd 20 NC
21 NC 22 Gnd
23 IOW 24 Gnd
25 IOR 26 Gnd
27 NC 28 ALE
29 NC 30 Gnd
31 IRQ 14 32 IOCS16
33 Add 1 34 NC
35 Add 0 36 Add 2
37 CS 0 38 CS 1
39 Light 40 Gnd

P12 - IDE Hard Driv e LED Conn ector

4 pin single row header, Amp #640456-4

PIN SIGNAL
1 +5V Pullup
2 Light
3 Light
4 +5V Pullup

1-C4DX-14 TECHNICAL REFERENCE

SPECIFICATIONS

INTRODUCTION - SB386SX/25

The SB386SX/25 (C3SX) full-featured ISA processor is a single
board computer which features CPU, DRAM, floppy controller, IDE
interface, two serial ports, parallel port, coprocessor socket, speaker
port and keyboar d por t on a single ISA card. This si ngle-slot, high
performance processor plugs into ISA Bus passive backplanes and
provides 100% PC/AT compatibility for the system expansion slots.

MODEL NUMBER

SB386SX/25 386SX CPU at 25MHz

FEATURES

• 80386SX microprocessor at 25MHz

• Two serial ports and one parallel port

• Floppy drive and IDE drive interface

• Automatic or Manual Peripheral Configuration

C

3
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X

• Coprocessor socket

• Selectable bus speed

• 64KB user EPROM space available

• Watchdog timer

• Supports up to 16MB of DRAM on-board

• Supports 256K x 9, 1MB x 9 and 4MB x 9 SIMM’s

• Shadow RAM for System BIOS and peripherals increases

system speed and performance

• Chips and Technologies Peak SX PC/AT Chip Set

TECHNICAL REFERENCE 1-C3SX-1

SPECIFICATIONS

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1-C3SX-2 TECHNICAL REFERENCE

PARALLEL

SERIAL(2)

IDE

FLOPPY

SPECIFICATIONS

ISA

BUS

C

3
S
X

711

BIOS

EPROM

RAS,CAS,MA0-10,MWE

PARITY

DRAM

TO 16 MBYTES

SA0-19

SD8-15

XD8-15

SD0-7

XD0-7

82C836

KEYBOARD

8042

SPEAKER

CMD

SA0-19,LA17-23

COMMAND

MODAO,2O

SBHE

D 0-15

BLE

A1-31,BHE

80386SX

ADS,M/IO,D/C

W/R,HLDA,RDY

SOCKET

COPROC

TECHNICAL REFERENCE 1-C3SX-3

SPECIFICATIONS

C

3
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Bank 2

ISA BUS

36 PIN

SX

ARRAY

386

SIMM

Coproc

Socket

Battery

P1

Battery enable JU3

Bank 1

External

Battery

Floppy

IDE

LED

JU8 Precomp

JU10 Watchdog timer

JU7 Drive type

JU1 Mono/color

ResetIDE

ISA BUS

62 PIN

JU4 Serial port 1 Int.

JU5 Serial port 2 Int.

JU6 Parallel port Int.

JU11 Password

Clear

Keylock

P2P10P11P3

Speaker

Keyboard P4

BIOS

Serial port 2

Serial

Port 1

P6

1-C3SX-4 TECHNICAL REFERENCE

Port

Parallel

P8

P7

SPECIFICATIONS

PROCESSOR

• 80386SX

CPU CLOCK

• 25MHz

BUS SPEED

• 8.33MHz default, selectable through BIOS Setup

ON-BOARD FEATURES

• Speaker port

• Keyboard port

• Floppy disk c ontroller supports two floppy driv es . Drives

can be 3-1/2" or 5-1/4" or one of each.

• Two serial ports

• Parallel printer port - bidirectional

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• IDE interface supports two integrated drive electronics hard

drives

• On-board battery

RAM MEMORY - 1 MB to 16 MB

Processor Board RAM Memory:

• 1MB to 16MB memory on processor board

• 1MB - 4 256K x 9 SIMM’s

• 2MB - 2 1MB x 9 SIMM’s

• 4MB - 4 1MB x 9 SIMM’s

• 8MB - 2 4MB x 9 SIMM’s, install in Bank 2

TECHNICAL REFERENCE 1-C3SX-5

SPECIFICATIONS

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Processor Board RAM Memory (continued):

• 10MB - 2 1MB x 9 (Bank 1) an d 2 4MB x 9

(Bank 2) SIMM’s

• 16MB - 4 4MB x 9 SIMM’s

NOTE: Two SIMM’s of the same memory capacity must be used to
fill a memory bank. Bank 1 (U18 and U20) must be filled before
Bank 2 (U19 and U21), except in the 8MB configuration.

NOTE: The top 128KB of the 16MB address space is m ap pe d to the
High ROM area. Therefore, on a 16MB system, this area is not avail­able as RAM.

• RAM Speed

• < 60 nanoseconds, 0 wait state or < 80 nanoseconds,

1 wait state. (For Additional RAM Wa it State for
25MHz/80 ns. operation, see the Advanced Setup
section of this manual.)

ROM MEMORY

• BIOS ROM memory on the pr oc es sor boa r d is 1 27C512

(64K x 8); 64K user EPROM available with optional
27C1010 (128K x 8).

PERFORMANCE

• Norton SI Version 6.0

• 25MHz - 17.5

1-C3SX-6 TECHNICAL REFERENCE

SPECIFICATIONS

POWER REQUIREMENTS

Voltage:

+5V @ 1.3 Amps typical
+12V @ < 100 mAmps typical

-12V @ < 100 mAmps typical

ENVIRONMENT

Operating Temperature: 0° C to 60° C.
Storage Temperature: -20° C to 70° C.

Humidity Maximum: 90% non-condensin g

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TECHNICAL REFERENCE 1-C3SX-7

SPECIFICATIONS

CONFIGURATION JUMPERS

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The setup of the configuration jumpers on the processor is described

S

below. * indic a te s the default va lue of each jump er.

X

NOTE: For two-position ju mpers (3-post) , "RIGHT" is towa r d the
bracket end of the board; "LEFT" is toward the memory sockets.

Jumper Description
JU1 CRT Type Select

Install on the TOP for a color CRT. *
Install on the BOTTOM for a monochrome CRT.

JU3 Battery Enable

Install on the LEFT to use the on-board battery. *
Install on the RIGHT to use an external battery.

JU4 On-Boar d S erial Port 1 Interru pt Select

Install on the LEFT for IRQ3.
Install on the RIGHT for IRQ4. *

JU5 On-Boar d S erial Port 2 Interru pt Select

Install on the LEFT for IRQ3. *
Install on the RIGHT for IRQ4.

JU6 On-Boar d P ara llel Port 1 Interr upt Select

Install on the LEFT for IRQ5.
Install on the RIGHT for IRQ7. *

JU7 Floppy Drive Type Select

Install for dual speed drives.
Remove for single speed drives. *

JU8 Flopp y Pre c ompensation S el e ct

Install for normal. *
Remove for alternate.

1-C3SX-8 TECHNICAL REFERENCE

SPECIFICATIONS

CONFIGURATION JUMPERS (continued)

Jumper Description

JU10 Watchdog Timer

Install on the LEFT to enable the watchdog timer.
Install on the RIGHT for normal reset operation. *

JU11 Passwo r d Clear

Install for one power-up cycle to reset the password to

the default (null password).

Remove for normal operation. *

SYSTEM BIOS

The System BIOS is an AMI Hi-Flex BIOS with ROM-resident
setup utilities. The foll owing Setup util ities are sel ectable from the
main BIOS Setup Menu:

• Standard CMOS Setup

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• Advanced CMOS Setup

• Advanced Chip Set Setup

• Peripheral Management Setup

• Change Password

• Auto Configuration with BIOS Defaults

WATCHDOG TIMER

The watchdog timer is a hardware timer that resets the processor
board if the timer is not refreshed by software periodically. The
timer is typically used to restart an application which becomes hung
on an external e ve nt. When the applic a tion is hung, it can no longer
refresh the t imer. The watchd og timer then times out and rese ts the
processor board.

TECHNICAL REFERENCE 1-C3SX-9

SPECIFICATIONS

The watchdog tim e r has two levels of enable. First, th e watc hdog

C

timer jumper must be moved to the "enabled" position, which puts

3

the watchdog timer under softwar e control. Second, use r-supplied

S

software must start the watchdog timer via Keyboard Controller

X

(8042) Port 2, bit 3 (P23). P23 is set high from reset. Set ti ng P23
low starts the wat ch dog timer timeout of 1.2 seconds (nom inal).
Before the end of the timeout , P23 must be toggled high then low to
restart the timeout. If P 23 is left low un til the end of th e t imeout, th e
watchdog timer issues a hardware reset to the processor board. The
timer should be refreshed by the software every 1.0 seconds to
prevent a timeout.

A set of watchdog timer software is available from Technical Sup­port. The software includes sample C code which can be embedded
in a user program and demo software to demonstrate and test the
watchdog timer.

1-C3SX-10 TECHNICAL REFERENCE

SPECIFICATIONS

CONNECTORS

NOTE: Pin 1 on the connectors is indi cated by the square pad on

the PCB.

P1 - External Battery Connector for CMOS Memory

3 pin single row header, Amp #640456-3
PIN SIGNAL

1 Positive
2NC
3 Negative

P2 - Keylock Connector

5 pin single row header, Amp #640456-5
PIN SIGNAL

1 LED Power
2 Key
3 Gnd
4 Keylock Data
5 Gnd

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P3 - Floppy Drive Connector

34 pin dual row header, Molex #10-89-1341
PIN SIGNAL PIN SIGNAL

1 Gnd 2 N-RPM
3 Gnd 4 NC
5 Gnd 6 NC
7 Gnd 8 P-Index
9 Gnd 10 N-Motoron 1
11 Gnd 12 N-Drive Sel2
13 Gnd 14 N-Drive Sel1
15 Gnd 16 N-Motoron 2
17 Gnd 18 N-Dir
19 Gnd 20 N-Stop Step
21 Gnd 22 N-Write Data

TECHNICAL REFERENCE 1-C3SX-11

SPECIFICATIONS

P3 - Floppy Drive Connector (continued)

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PIN SIGNAL PIN SIGNAL
23 Gnd 24 N-Write Gate
25 Gnd 26 P-Track 0
27 Gnd 28 P-Write Protect
29 Gnd 30 N-Read Data
31 Gnd 32 N-Side Select
33 Gnd 34 Disk Chng

P4 - Keyboard Connector

5 pin single row header, Amp #640456-5

PIN SIGNAL
1 Kbd Clock
2 Kbd Data
3 Key
4 Kbd Gnd
5 Kbd Power (+5V fused)

P5 - Speaker Port Connector

4 pin single row header, Amp #640456-4

PIN SIGNAL
1 Speaker Data
2 Key
3 Gnd
4 +5V

P6 - Serial Port 1 Connector

9 pin D, Amp #747840-3

PIN SIGNAL PIN SIGNAL
1 Carrier Detect 6 Data Set Ready-I
2 Receive Data-I 7 Request to Send-O
3 Transmit Data-O 8 Clear to Send-I
4 Data Terminal Ready-O 9 Ring Indi cat or -I
5 Signal Gnd

1-C3SX-12 TECHNICAL REFERENCE

SPECIFICATIONS

P7 - Serial Port 2 Connector

10 pin dual row header, Molex #10-89-1101

PIN SIGNAL PIN SIGNAL
1 Carrier Detect 2 Data Set Ready-I
3 Receive Data-I 4 Request to Send-O
5 Transmit Data-O 6 Clear to Send-I
7 Data Terminal Ready-O 8 Ring Indi cat or -I
9 Signal Gnd 10 NC

P8 - Parallel Port Connector

25 pin D, Amp #747846-3

PIN SIGNAL PIN SIGNAL
1 Strobe 14 Auto Feed XT
2 Data Bit 0 15 Error
3 Data Bit 1 16 Init
4 Data Bit 2 17 Slct In
5 Data Bit 3 18 Gnd
6 Data Bit 4 19 Gnd
7 Data Bit 5 20 Gnd
8 Data Bit 6 21 Gnd
9 Data Bit 7 22 Gnd
10 ACK 23 Gnd
11 Busy 24 Gnd
12 Paper End 25 Gnd
13 Slct

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P10 - Exter na l Re se t Conn e ctor

2 pin header, Amp #640456-2
PIN SIGNAL

1 Negative External Reset
2 Gnd

TECHNICAL REFERENCE 1-C3SX-13

SPECIFICATIONS

P11 - IDE Hard Driv e Conn e ctor

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40 pin dual row header, Molex #10-89-1401
PIN SIGNAL PIN SIGNAL

1 Reset 2 Gnd
3 Data 7 4 Data 8
5 Data 6 6 Data 9
7 Data 5 8 Data 10
9 Data 4 10 Data 11
11 Data 3 12 Data 12
13 Data 2 14 Data 13
15 Data 1 16 Data 14
17 Data 0 18 Data 15
19 Gnd 20 NC
21 NC 22 Gnd
23 IOW 24 Gnd
25 IOR 26 Gnd
27 NC 28 ALE
29 NC 30 Gnd
31 IRQ 14 32 IOCS16
33 Add 1 34 NC
35 Add 0 36 Add 2
37 CS 0 38 CS 1
39 Light 40 Gnd

P12 - IDE Hard Driv e LED Conn ector

4 pin single row header, Amp #640456-4
PIN SIGNAL

1 +5V Pullup
2 Light
3 Light
4 +5V Pullup

1-C3SX-14 TECHNICAL REFERENCE

ISA BUS PIN NUMBERING

62-pin ISA Bus
Connector

ISA REFERENCE

Co m p onent Side
of Board

36-pin ISA Bus
Connector

TECHNICAL REFERENCE 2-1

ISA REFERENCE

ISA BUS PIN ASSIGNMENTS

The following figures summarize pin assignments for the Industry
Standard Architecture (ISA) Bus connectors.

I/O Pin Signal Nam e I/O

A1 IOCHK# I
A2 D7 I/O
A3 D6 I/O
A4 D5 I/O
A5 D4 I/O
A6 D3 I/O
A7 D2 I/O
A8 D1 I/O
A9 D0 I/O
A10 CHRDY I
A11 AEN O
A12 SA19 I/O
A13 SA18 I/O
A14 SA17 I/O
A15 SA16 I/O
A16 SA15 I/O
A17 SA14 I/O
A18 SA13 I/O
A19 SA12 I/O
A20 SA11 I/O
A21 SA10 I/O
A22 SA9 I/O
A23 SA8 I/O
A24 SA7 I/O
A25 SA6 I/O
A26 SA5 I/O
A27 SA4 I/O
A28 SA3 I/O
A29 SA2 I/O
A30 SA1 I/O
A31 SA0 I/O

I/O Pin Signal Nam e I/O

B1 Gnd Ground
B2 RESDRV O
B3 +5V Power
B4 IRQ9 I
B5 -5V Power
B6 DRQ2 I
B7 -12V Power
B8 NOWS# I
B9 +12V Power
B10 Gnd Ground
B11 SMWTC# O
B12 SMRDC# O
B13 IOWC# I/O
B14 IORC# I/O
B15 DAK3# O
B16 DRQ3 I
B17 DAK1# O
B18 DRQ1 I
B19 REFRESH# I/O
B20 BCLK O
B21 IRQ7 I
B22 IRQ6 I
B23 IRQ5 I
B24 IRQ4 I
B25 IRQ3 I
B26 DAK2# O
B27 T-C O
B28 BALE O
B29 +5V Power
B30 OSC O
B31 Gnd Ground

2-2 TECHNICAL REFERENCE

ISA BUS PIN ASSIGNMENTS (continued)

ISA REFERENCE

I/O Pin Signal Nam e I/O

C1 SBHE# I/O
C2 LA23 I/O
C3 LA22 I/O
C4 LA21 I/O
C5 LA20 I/O
C6 LA19 I/O
C7 LA18 I/O
C8 LA17 I/O
C9 MRDC# I/O
C10 MWTC# I/O
C11 D8 I/O
C12 D9 I/O
C13 D10 I/O
C14 D11 I/O
C15 D12 I/O
C16 D13 I/O
C17 D14 I/O
C18 D15 I/O

I/O Pin Signal Nam e I/O

D1 M16# I
D2 IO16# I
D3 IRQ10 I
D4 IRQ11 I
D5 IRQ12 I
D6 IRQ15 I
D7 IRQ14 I
D8 DAK0# O
D9 DRQ0 I
D10 DAK5# O
D11 DRQ5 I
D12 DAK6# O
D13 DRQ6 I
D14 DAK7# O
D15 DRQ7 I
D16 +5V Power
D17 Master16# I
D18 Gnd Ground

TECHNICAL REFERENCE 2-3

ISA REFERENCE

ISA BUS SIGNAL DESCRIPTIONS

The followin g is a de sc ri ption of the ISA Bus signals. All signal
lines are TTL-compatible.

AEN (O)

Address Enable (AEN) is used to degate the microprocessor and other devices
from the I/O channel to allow DMA transfers to take place. When this line is
active, the DMA controller has control of the address bus, the data-bus Read
command lines (memory and I/O), and the Write command lines (memory and
I/O).

BALE (O ) (Buff e red)

Address Latch Enable (BALE) is provided by the bus controller and is used on
the system board to latch valid addresses and memory decodes from the
microp rocessor . It is a vailable to th e I/O c hannel as an ind icator of a valid
microprocessor or DMA address (when used with AEN). Microprocessor
address es S A[19: :0] ar e la tched with t he fal lin g edge of BAL E. BA LE i s forc ed
high during DMA cycles.

BCLK (O)

BCLK is the system clock. The clock has a 50% duty cycle. This signal should
only be used for synchronization. It is not intended for uses requiring a fixed
frequency.

CHRDY (I)

I/O Channel Ready (CHRDY) is pulled low (not ready) by a memory or I/O
device to lengthen I/O or memory cycles. Any slow device using this line
should drive it low immediately upon detecting its valid address and a Read or
Write command. Machine cycles are extended by an integral number of clock
cycle s . This si gnal should be held low for no more than 2.5 mi croseco nds.

D[15::0] (I/O)

Data signals D[15::0] provide bus bits 15 through 0 for the microprocessor,
memory, and I/O devices. D15 is the most-significant bit and D0 is the
least-significant bit. All 8-bit devices on the I/O channel should use D[7::0] for
communica tio ns to the mi croprocessor . Th e 16 -bit devices w ill u se D[15::0].
To support 8-bit devices, the data on D[15::8] will be gated to D[7::0] during
8-bit transfers to these devices. 16-bit microprocessor transfers to 8-bit
devices will be converted to two 8-bit transfers.

DAK[7::5]#, DAK[3::0]# (O)

DMA Acknowledge DAK[7::5]# and DAK[3::0]# are used to acknowledge DMA
requests DRQ[7::5] and DRQ[3::0]. They are active low.

2-4 TECHNICAL REFERENCE

ISA REFERENCE

DRQ[7::5], DRQ[3::0] (I)

DMA Requests DRQ[7::5] and DRQ[3::0] are asynchronous channel requests
used by peripheral devices and the I/O channel microprocessors to gain DMA
service (or control of the system) . They are prioriti zed, wit h DRQ0 having the
highest priority and DRQ7 having the lowest. A request is generated by
bringing a DR Q line to an active level. A DRQ line m ust be held high unt il the
corresponding DMA Request Acknowledge (DAK) line goes active. DRQ[3::0]
will perform 8-bit DMA transfers; DRQ[7::5] will perform 16-bit transfers.

IO16# (I)

I/O 16-bit Chip Select (IO16#) signals the system board that the present data
transfer is a 16-bit, 1 wait-state, I/O cycle. It is derived from an address decode.
IO16# is active low and should be driven with an open collector or tri-state
driver capable of sinking 20 mAmps.

IOCHK# (I)

I/O Channel Check (IOCHK#) provides the system board with parity (error)
information about memory or devices on the I/O channel. When this signal is
active, it indicates an uncorrectable system error.

IORC# (I/O)

I/O Read (IORC#) instructs an I/O device to drive its data onto the data bus.
It may be driven by the system microprocessor or DMA controller, or by a
microprocess or or DMA controlle r resident on the I/O channel. This signal is
active low.

IOWC# (I/O)

I/O Write (IOWC#) instructs an I/O device to read the data on the data bus. It
may be d r iv en by any micr o pr o cessor or DM A c ontroller in the s ys tem. Thi s
signal is active low.

IRQ[15::14], IRQ[12::9], IRQ[7::3] (I)

Interrupt Requests IRQ[15::14], IRQ[12::9] and IRQ[7::3] are used to signal
the mi cro pro ce ss or t ha t an I/O de vi ce nee ds at ten t ion. Th e in t err upt re qu es ts
are prioritized, with IRQ[15::14] and IRQ[12::9] having the highest priority
(IRQ9 is the highest) and IRQ[7::3] having the lowest priority (IRQ7 is the
lowest). An interrupt request is generated when an IRQ line is raised from low
to high. The line mu st be hel d high unti l the micr opro cessor ac knowl edge s
the interrupt request (Interrupt Service routine).

LA[23::17] (I/O)

These signals (unlatched) are used to address memory and I/O devices within
the system. They give the system up to 16MB of addressability. These signals
are vali d when BA LE is high . LA[23: :17] are not latche d during micropr ocesso r
cycles and therefore do not stay valid for the whole cycle. Their purpose is to
generate memory decode s for 1 wait-state me mory cycles. These de codes
should be latched by I/O adapters on the falling edge of BALE. These signals

TECHNICAL REFERENCE 2-5

ISA REFERENCE

also may be driven by other microprocessors or DMA controllers that reside
on the I/O channel.

M16# (I)

M16# Chi p Select signal s the syste m board if the pr esent dat a tran sfer is a
1 wait-state, 16-bit, memory cycle. It must be derived from the decode of
LA[23::17]. M16# should be driven with an open collector or tri-state driver
capable of sinking 20 mAmps.

Master16# (I)

Master1 6# is us ed wi th a DRQ li ne to ga in co ntr ol of the sys t em. A pr oc es sor
or DMA controller on the I/O channel may issue a DRQ to a DMA channel in
cascade mode and receive a DAK#. Upon receiving the DAK#, an I/O
microprocessor may pull Master16# low, which will allow it to control the system
address, data, and control lines (a condition known as tri-state). After
Master16# is low, the I/O microprocessor must wait one system clock period
before driving the address and data lines, and two clock periods before issuing
a Read or Write command. If this signal is held low for more than
15 microseconds, system memory may be lost because of a lack of refresh.

NOWS# (I)

The No Wait State (NOWS#) signal tells the microprocessor that it can
comple te t h e pr es ent bu s cycl e wi tho ut in se rti ng an y ad dit iona l wa it cy cl es . In
order to run a memory cycle to a 16-bit device without wait cycles, NOWS# is
derived from an address decode gated with a Read or Write command. In
order to run a memory cycle to an 8-bit device with a minimum of two wait
states, NOWS# should be driven active on system clock after the Read or Write
command is active gated with the address decode for the device. Memory
Read and Write commands to a 8-bit device are active on the falling edge of
the system clock. NOWS# is active low and should be driven with an open
collector or tri-state driver capable of sinking 20 mAmps.

OSC (O)

Oscillator (OSC) is a high-speed clock with a 70-nanosecond period (14.31818
MHz). This signal is not synchronous with the system clock. It has a 50% duty
cycle.

REFRESH# (I/O)

The REFRESH# signal is used to indicate a refresh cycle and can be driven
by a microprocessor on the I/O channel.

RESDRV (O)

Reset Drive (RESDRV) is used to reset or initialize system logic at power-up
time or during a low line-voltage outage. This signal is active high.

SA[19::0 ] (I/O)

Address bits SA[19::0] are used to address memory and I/O devices within the
system. Thes e twe nty ad dre ss line s, in addi tio n to LA [23:: 17 ], al low a cces s

2-6 TECHNICAL REFERENCE

ISA REFERENCE

of up to 16MB of memory. SA[19::0] are gated on the system bus when BALE
is high and are latched on the falling edge of BALE. These signals are
generated by the microprocessor or DMA Controller. They also may be driven
by other microprocessors or DMA controllers that reside on the I/O channel.

SBHE# (I/O)

System Bus High Enable (SBHE#) indicates a transfer of data on the upper
byte of t he data bus, D[15:: 8]. 16 -bit devic es us e SBH E# to cond itio n data b us
buffers tied to D[15::8].

SMRDC# (O), MRDC# (I/O)

These s ignals i nstruc t the m emor y device s to driv e data onto th e data bus .
SMRDC# is active only when the memory decode is within the low 1MB of
memory space. MRDC# is active on all memory read cycles. MRDC# may
be driven by any microprocessor or DMA controller in the system. SMRDC is
derived from MRDC# and the decode of the low 1MB of memory. When a
microprocessor on the I/O channel wishes to drive MRDC#, it must have the
address lines valid on the bus for one system clock period before driving
MRDC# active. Both signals are active low.

SMWTC# (O), MWTC# (I/O)

These signals instruct the memory devices to store the data present on the
data bus. SMWTC# is active only when the memory decode is within the low
1MB of the memo ry space. MWTC# is active on all memory write cyc les.
MWTC# may be driven by any microprocessor or DMA controller in the system.
SMWTC# is derived from MWTC# and the decode of the low 1MB of memory.
When a microprocessor on the I/O channel wishes to drive MWTC#, it must
have the address lines valid on the bus for one system clock period before
driving MWTC# active. Both si gnals ar e active l ow.

T-C (O)

Terminal Count (T-C) provides a pulse when the terminal count for any DMA
channel is reached.

TECHNICAL REFERENCE 2-7

ISA REFERENCE

I/O ADDRESS MAP

Hex Range Device
000-01F DMA Controller 1

020-03F Interrupt Controller 1, Master
040-05F Timer
060-06F 8042 (Keyboard)
070-07F Realtime Cloc k, NMI (non-ma sk able interr u pt) Ma sk
080-09F DMA Page Register
0A0-0B F Interrupt Controller 2
0C0-0DF DMA Controller 2
0F0 Clear Math Coprocessor Busy
0F1 Reset Math Coprocessor
0F8-0FF Math Coprocessor

1F0-1F8 Fixed Disk
200-207 Game I/O
278-27F Parallel Printer Port 2
2F8-2FF Serial Port 2
300-31F Prototype Card
360-36F Reserved
378-37F Parallel Printer Port 1
380-38F SDLC, Bisynchronous 2
3A0-3A F Bisynchronous 1
3B0-3BF Monochrome Display and Printer Adapter
3C0-3CF Reserved
3D0-3DF Color/Graphics Monitor Adapter
3F0-3F7 Diskette Controller
3F8-3FF Serial Port 1

INTERRUPT ASSIGNMENTS

Interrupt Description
IRQ0 Timer Output 0

IRQ1 Keyboard (Output Buffer Full)
IRQ2 Interrupt 8 through 15
IRQ3 Serial Port 2
IRQ4 Serial Port 1
IRQ5 Parallel Port 2
IRQ6 Diskette Controller
IRQ7 Parallel Port 1
IRQ8 Realtime Clock Interrupt
IRQ9 Software Redirected to INT 0AH (IRQ2)
IRQ10 Unassigned
IRQ11 Unassigned
IRQ12 Unassigned
IRQ13 Coprocessor
IRQ14 Fixed Disk Controller
IRQ15 Unassigned

2-8 TECHNICAL REFERENCE

SYSTEM BIOS

BIOS OPERATION

Sections 3 through 6 of this manual describe the operation of the
BIOS and BIOS Setu p for proc e ssor boards which use th e AM I
Hi-Flex System BIOS. Refer to Running the BIOS Setup Programs
later in thi s se ct ion for standard Setup screens, options and default s.
The available Setup screens, options and defaults may vary for your
processor board.

When the system is powered on, the BIOS performs the Power-On
Self Test (POST) rou ti ne s. These routines are divide d into two
phases:

1) System Test and Initialization. Test and initialize system

boards for normal operations.

2) System Configuration Verification. Compare defi ne d c on-

figuration with hardware actually installed.

If an error is encountered during the diagnostic tests, the error is
reported in one of two different ways. If the error occurs before the
display d ev ic e is initialized, a seri e s of b eeps is transmitted. If the
error occurs after the display device is initialized, the error message
is displaye d on the screen. See BIO S Errors later in this section for
more information on possible errors.

The following are the Power-On Self Tests (POST’s) which are per­formed when the system is powered on:

• Processor Register Test

• ROM BIOS Checksum Check

• Keyboard Controller Test

• CMOS Shutdown Register Test

• Channel 2, 1, 0 Timer Test

• Memory Refresh Test

• Base 64KB RAM Test

• CMOS Battery, Options Set, Checksum Check

TECHNICAL REFERENCE 3-1

SYSTEM BIOS

• Display Type Verification

• Entering Protected Mode

• Address Line Test and Memory Size Finding

• Conventional and Extended Memory Test

• DMA Controller Test

• Keyboard Test

• System Configuration Verification and Setup

NOTE: When you perform a warm boot by pr e ssing
<Ctrl><Alt><Del>, all memory tests are bypassed.

The BIOS attempts to initialize the peripheral devices by verifying
the validity of the system setup information stored in the system
CMOS RAM. (See the Running the CMOS Setup Programs section
of this manual.) If the BIOS detects a fault, the screen displays the
error conditi on( s) which has/have bee n de te c te d. If no e rror s a r e
detected, the BIOS attempts to load the system from any bootable
device, such as a floppy disk or hard disk.

Normally, the only POST routine visible on the screen is the memory
test. The foll owi ng screen displays whe n the system is power e d on:

AMIBIOS (C)1994 American Megatrends Inc.
INDUSTRIAL COMPUTER SOURCE
XXXXXX

Hit DEL if you want to run SETUP

Initial Power-On Screen

3-2 TECHNICAL REFERENCE

SYSTEM BIOS

You have two options:

• Press <Del> to access the System BIOS Setup program.

This option allows you to change various system parameters
such as date and time, disk drive s, video display, e tc . The
Running the CMOS Setup Programs section of this manual
describes the options available.

You may be requested to enter a password before gaining ac­cess to the BIOS Setup program. (See Password Entry later
in this section.)

If you enter the correct password or no password is required,
the BIOS Setup M enu displays. (See Running The CMOS
Setup Programs later in this section.)

• Allow the bootup process to continue without invoking the

System BIOS Setup program.

In this case, after the BIOS loads the system, you may be re­quested to enter a password.

Password Entry

The system may be configured so that the user is required to enter a
password each time the system boots or whenever an attempt is
made to ente r t he Setup programs. The pas swor d f unc tion may also
be disabled so that the password prompt will not appear under any
circumstances.

The Password Checking Option in the Advanced CMOS Setup pro­gram allows you to spe c ify whe n the password prompt wi ll display:
Always or only when Setup is at te m pted. The password may be
changed using the Change Password option on the BIOS Setup
Menu. If the pas swor d is null, the passwor d pr om pt will not disp la y
at any time. A more detailed description of the passwo rd set up f unc ­tion may be found in the Running the CMOS Setup Programs section
of this manual.

TECHNICAL REFERENCE 3-3

SYSTEM BIOS

When password checking is enabled, the following password prompt
displays:

Enter CURRENT Password:

Type the password and press <Enter>.

NOTE: The null password is th e sy stem def ault and is in eff ect if a

password has not be e n assigned or if the CM OS is corrupted. In thi s
case, the pass wor d pr ompt does not display. To set up a passwo rd ,
you may use the Change Password function of the BIOS Setup
Menu. (See the Running the CMOS Set up Programs section of this
manual.)

If an incorrect password is entered, the following screen displays:

Enter CURRENT Password: X
Enter CURRENT Password:

You may try again to ent e r the corr e ct pa sswor d. If you enter the
password incorrectly three times, the system responds in one of two
different ways, depending on the value specified in the Password
Checking Optio n on the Advanced CMOS Set up sc r een. (Se e the
Running the CMOS Setup Programs section of this manual for a
description of this option.)

3-4 TECHNICAL REFERENCE

SYSTEM BIOS

1) If the Password Checking Option is set to Setup, the system

does not let you enter Setup, but does continue the booting
process. You mus t r eb oot the system manu al ly to retry enter ­ing the password.

2) If the Password Checking Option is set to Always, the system

locks and you m ust reboot. After rebooting, you wil l be re­quested to enter the password.

Once the password has been entered correctly, you are allowed to
continue.

BIOS Errors

If an error is encountered during the diagnostic checks performed
when the system is powered on, the error is reported in one of two
different ways:

1) If the error occurs before the display device is initialized, a
series of beeps is transmitted.

2) If the error occurs after the display device is initialized, the
screen displays the error message. In the case of a non-fatal
error, a prompt to press the <F1> key may also appear on the
screen.

Explanations of the beep codes and BIOS error messages may be
found in Appendix A - BIOS Messages.

As the POST routines are performed, test codes are presented on
Port 80H. These codes may be helpful as a diagnostic tool and are
listed in Appendix A - BIOS Messages.

If any of the following error conditions is detected by the BIOS
during the POST routines, you will be asked to run the Setup utility:

• CMOS battery state low

• CMOS system options not set

• CMOS checksum failure

TECHNICAL REFERENCE 3-5

SYSTEM BIOS

• CMOS memory size mismatch

• CMOS time & date not set

• CMOS display type mismatch

• C: drive failure

These error messages are followed by this screen:

AMIBIOS (C)1994 American Megatrends Inc.
INDUSTRIAL COMPUTER SOURCE
XXXXXX

RUN SETUP UTILITY
Press F1 to RESUME

NOTE: Pausing the system after a non-fat a l e rror ma y be bypassed
by disabling the "Wait for "F1" If Any Error" option in the Advanced
Setup program . S ee the Advanced Setup section of this ma nual.

Press <F1>. You may be re que sted to enter a pass word be fo re ga in­ing access to the BIOS Setup program. (Se e Pas swo rd Entry earlier
in this section.)

If you enter the correct password or no password is required, the
BIOS Setup Menu displays.

3-6 TECHNICAL REFERENCE

SYSTEM BIOS

RUNNING THE CMOS SETUP PROGRAMS

The Setup programs keep a record of the system parameters, such as
memory amounts, disk drives, video display, and numeric coproces­sors. Setup res ides in the Read Only Me mory Basic Input/Output
System (ROM BIOS) so that it is available each time the system is
turned on . Se tup stores the i nformation i n the complementary metal
oxide semiconductor (CMOS) memor y. When the syste m is tur ne d
off, a backup battery retains system parameters in the CMOS
memory.

Each time the system is powered on, it is configured with these
values, unle ss the CMOS has been co rrupted or is fault y. The sy s­tem Setup program is resident in the ROM BIOS (Read Only
Memory Basic Input/Output System) so that it is available each time
the computer is turned on. If, for some reason, the CMOS becomes
corrupted, the system is configured with the default values stored in
this ROM file.

As soon as the system is turned on, the power-on diagnostic routines
check memory, attempt to prepare peripheral devices for action, and
offer you the option of pressing <Del> to run Setup.

If certain non-fatal errors occur during the Power-On Self Test
(POST) routines which are run when the system is turned on, you
may be prompted to run Setup by pressing <F1>. See BIOS Errors
earlier in this section for possible errors which may occur during the
POST routines.

TECHNICAL REFERENCE 3-7

SYSTEM BIOS

BIOS SETUP MENU

When you press <F1> in response to an error message received
during the POST routines or when you press the <Del> key to enter
the BIOS Setup Program, the following screen displays:

BIOS SETUP PROGRAM - AMI BIOS SETUP UTILITIES

(C)1994 American Megatrends Inc., All Rights Reserved

STANDARD CMOS SETUP

ADVANCED CMOS SETUP

ADVANCED CHIPSET SETUP

PERIPHERAL MANAGEMENT SETUP

AUTO CONFIGURATION WITH BIOS DEFAULTS

CHANGE PASSWORD

AUTO DETECT HARD DISK

WRITE TO CMOS AND EXIT

DO NOT WRITE TO CMOS AND EXIT

Standard CMOS Setup for Changing Time, Date, Hard Disk Type, etc.

ESC:Exit ↓→↑←:Sel F2/F3:Co lo r F10:Sav e & Exit

BIOS Setup Menu

NOTE: The BIOS Setup Menu and the options available for each

selection on the menu may vary ac cording to processor boa r d. See
individual processor board sections for more specific information.

Use the Down Arrow key to highlight the desired option and press
<Enter>.

3-8 TECHNICAL REFERENCE

SYSTEM BIOS

• Select STANDARD CMOS SETUP to make changes to the

Standard CMOS Setup. The Setup program is described in
the Standard CMOS Setup sect ion of this manual. The fol­lowing options may be changed:

• Date and time

• Hard disk type

• Floppy drive type

• Primary display

• Keyboard

• Select ADVANCED CMOS SETUP to make changes to

the Advanced CMOS Setup. The Setup progr a m is
described in the Advanced Setup section of thi s ma nual. The
following options may be changed:

• Above 1 MB Memory Test

• Hit <DEL> Message Display

• Wait for <F1> If Any Error

• System Boot Up Num Lock

• Numeric Processor Test

• Floppy Drive Seek at Boot

• System Boot Up Sequence

• External Cache Memory

• Internal Cache Memory

• Password Checking Option

• Video ROM Shadow

• Adaptor ROM Shadow

• System ROM Shadow

• Boot Sector Virus Protection

TECHNICAL REFERENCE 3-9

SYSTEM BIOS

• Select ADVANCED CHIPSET SETUP to make changes

to the Advance d Chip Set Setup. The Se tup program is
described in the Advanced Setup section of thi s ma nual. The
following types of options are included in this selection,
depending on requirements for the specific chip set used.

• Bus Speed

• DMA Speed

• Memory Wait States

• Select PERIPHERAL MANAGEMENT SETUP to make

changes to the P eripheral Manage me nt Setup. The Setup
program is described in the Peripheral Management Setup
section of th is manual. The following options may be
changed:

• Programming Option

• On-Board Floppy Drive

• On-Board IDE Drive

• First Serial Port Address

• Second Serial Port Address

• Parallel Port Address

• Parallel Port Mode

• Select AUTO CONFIGURATION WITH BIOS

DEFAULTS to load the BIOS Setup default values for the
Advanced CMOS and Adva nce d Chi p S et opt ions. The
BIOS Setup default values may be found on the Advanced
CMOS and Advanced Chip Set Setup screens shown in the
Advanced Setup section of this manual. After selecting th is
option, you r e ma in at the BIOS Setu p Me nu sc r e en . To sa ve
the BIOS Setup default values in CMOS memory, be sure to
select WRITE TO CMOS AND EXIT.

3-10 TECHNICAL REFERENCE

SYSTEM BIOS

• Select CHANGE PASSWORD to change the password re-

quired for access to the system or to the BIOS Setup
programs. The proc e dur e use d to c ha nge the password is
described later in this section.

• Select AUTO DETECT HARD DISK to have the BIOS

automatically detect the type and parameters of each hard
drive if you have IDE drive(s). This opti on is described later
in this section.

• Select WRITE TO CMOS AND EXIT to save changes

which have been made to the Setup screens or to the
password, or if Auto Configuration with BIOS Defaults has
been selected and you want to save the default values in
CMOS memo ry . The system then con ti nues the booting
process.

• Select DO NOT WRITE TO CMOS AND EXIT to con-

tinue the booting process without saving any changes which
have been made to the Setup screens or to the password, or if
Auto Configuration with BIOS Defaults has been selected
and you do not want to save the default values in CMOS
memory.

TECHNICAL REFERENCE 3-11

SYSTEM BIOS

The Setup Programs

When you select one of the Setup options on the BIOS Setup Menu,
a warning message displays before any changes are allowed to any
of the setup parameters.

BIOS SETUP PROGRAM - WARNING INFORMATION

(C)1994 American Megatrends Inc., All Rights Reserved

Improper Use of Setup may Cause Problems !!

If System Hangs, Reboot System and Enter Setup by Pressing the <DEL> key

Do any of the following After Entering Setup
(i) Alter Options to make System Work

(ii) Load BIOS Setup Defaults

(iii) Load Power-On Defaults

Hit <ESC> to Stop now, Any other Key to Continue

BIOS Setup Warning Message Screen

You have two options:

• Press <Esc> to return to the BIOS Setup Menu screen.

• Press any other ke y to c ont inue with CMOS Setup. The

Setup screen you selected displays.

The Setup programs are explained in the Standard CMOS Setup,
Advanced Setup and Peripheral Management Setup sections of this
manual.

3-12 TECHNICAL REFERENCE

SYSTEM BIOS

Change Password

The Change Password option allows you to change the current
password or to disable the password checking prompt by entering a
null password.

The following window displays:

Enter CURRENT Password:

Type the current password and press <Enter>. The screen does not
display the characters typed. If you type the incorrect password or
press <Esc>, you return to the BIOS Setup Menu screen.

NOTE: The null password is th e sy stem def ault and is in eff ect if a
password has not be e n assigned or if the CM OS has been corrupt ed .
In this case, the "Enter CURRENT Password" prompt is bypassed.

After the current password has been correctly entered, the following
window displays:

Enter NEW Password:

Type the new password and press <Enter>. The password cannot
exceed six (6) characters in length. The screen does not display the
characters typed.

TECHNICAL REFERENCE 3-13

SYSTEM BIOS

NOTE: To disable password checking so that the password promp t
will not appear under any circumstances, create a null password by
pressing <Enter> without typing in a new passwor d. This returns
you immediately to the BIOS Se tup Menu screen. To save the null
password in CMOS memory, be sure to select WRITE TO CMOS
AND EXIT.

After you have entered the new password, the following window dis­plays:

Re-Enter NEW Password:

Re-key the new password and press <Enter>.

If the password confirmation is miskeyed, the following screen dis­plays:

ERROR, Press Any Key....

When you press any key, the screen clears and reissues the "Enter
NEW Password:" prompt.

If the password confirmation is entered correctly, the following
screen displays:

NEW Password Installed

Press <Esc> to return to the BIOS Setup Menu screen. This screen
allows you to save the change you have just made or exit from Setup

3-14 TECHNICAL REFERENCE

SYSTEM BIOS

without savi ng the new password. To save the ne w pa sswor d in
CMOS memory, be sure to select WRITE TO CMOS AND EXIT.

Auto Detect Hard Disk

The Auto Detect Hard Disk option allows you to have the BIOS auto­maticall y de te c t the type of hard disk dr ive(s) in your syste m. The
automatic detection functions only if you have IDE drives.

The following window displays:

Auto Detection in Progress

The auto detection is performed first for Hard Disk C:. The BIOS
searches for the hard disk, and if it can access the drive it reads the
disk parameters. It then searches the BIOS drive table for matching
parameters to determine the disk type and displays both the disk type
and parameter s on the screen as shown be low. If no matching
parameters are found, the BIOS specifies the type as "47=USER
TYPE." If it cannot access the drive, the BIOS times out and
specifies the type as "Not Detected."

The screen displays the parameters for the disk drive and asks if you
accept the values. After you accept or reject the parameters for Hard
Disk C: as explained below, the BIOS performs the auto detection
for Hard Disk D:.

NOTE: The auto dete c t feature displays di sk parameter value s a s es ­tablishe d by the drive manufacturer. If the drive has been forma tted
using any other values, accepting the auto detect values will cause er­ratic behavi or . You m ust either reformat the drive to meet the
manufacturer’s specifications or use Standard CMOS Setup to enter
parameters which match the current format of the drive.

TECHNICAL REFERENCE 3-15

SYSTEM BIOS

BIOS SETUP PROGRAM - AUTO DETECT HARD DISK

(C)1994 American Megatrends Inc., All Rights Reserved

Cyln Head WPcom LZone Sect Size (MB)
Hard Disk C: Type : 47=USER TYPE 683 16 65535 683 38 203

Accept Parameters for C: (Y/N) ? N

You have two options for each disk drive:

• Press ’N’ and <Enter> if you do not want to accept the hard

disk type and its associated parameters or if it is "Not
Detected." You may use St a nda r d CM OS S e tup to set up
the correct parameters for the drive.

• Press ’Y’ and <Enter> to accept the hard disk type and its

associated parameters. These disk type values will be dis­played when you vi e w the St a nda r d CM OS Se tup screen.
To save the hard disk parameter values in CMOS memory,
be sure to select WRITE TO CMOS AND EXIT when you
return to the BIOS Setup Menu screen.

Write to CMOS and Exit

The features selected and configured in the Setup screens are stored
in the CMOS when this option is selected. The password is saved,
and if Auto Configuration with BIOS Defaults has been selected, the
defaults are saved. The CMOS checksum is calculated and written
to the CMOS. Control is then passed back to the BIOS.

3-16 TECHNICAL REFERENCE

SYSTEM BIOS

The following window displays:

Write to CMOS and Exit (Y/N) ? N

You have two options:

• Press ’N’ and <Enter> to return to the Ma in Menu.

• Press ’Y’ and <Enter>to save the system parameters and

continue with the booting process.

Do Not Write to CMOS and Exit

This option passes control back to the BIOS without writing any
changes to the CMOS.

The following window displays:

Want to Quit Without Saving (Y/N) ? N

You have two options:

• Press ’N’ and <Enter> to return to the Main Menu.

• Press ’Y’ and <Enter> to continue with the booting process

without saving any system parameters.

TECHNICAL REFERENCE 3-17

SYSTEM BIOS

KEY CONVENTIONS

Listed below is an explanation of the keys displayed at the bottom of
the screens accessed through the System BIOS Setup program:

Key Task
<Esc> Exit to the BIOS Setup Menu.
Arrow keys Move the cursor to the desi red selection.
<Pg Up> Modify the def a ult value of the options for

<PgDn>, the highlighted feature. If there are fewe r
Ctrl/<PgUp> than 10 available op tions, the Ctrl/<PgUp>
Ctrl/<PgDn> and Ctrl/<PgDn> keys func tion the same as

the <PgUp> and <PgDn> keys.
<F1> Display help screen for the selected feature.
<F2>/<F3> Change background and foreground col or s.
<F5> Retrieve the values which were resident

when the current setup session was started.

These values will be CMOS values if the

CMOS was uncorrupted at the start of the

session, or they will be the BIOS Setup

default values.
<F6> Load all features in the Advanced CMOS

Setup, Advanced Chip Set Setup or Peri-

pheral Management Setup with the BIOS

Setup defaults.
<F7> Load all features in the Advanced CMOS

Setup, Advanced Chip Set Setup or Peri-

pheral Management Setup with the

Power-On defaults.
<F10> Save all changes made to Setup and exits

the program.
NOTE: The default value for the prompts which oc c ur whe n the

<F5>, <F6> and <F7> ke ys a r e pre sse d i s al wa ys
executing these options requires changing the

N (No). Actually

N to Y (Yes) and

pressing <Enter>.

3-18 TECHNICAL REFERENCE

STANDARD CMOS SETUP

STANDARD CMOS SETUP

When you enter Standard CMOS Setup, the following Setup screen
appears:

AMIBIOS SETUP PROGRAM - STANDARD CMOS SETUP

(C)1994 American Megatrends Inc., All Rights Reserved

Date (mn/date/year) : Thu, Feb 10 1994 Base memory size : 640 KB
Time (hour/min/sec) : 15 : 23 : 15 Ext. memory size : 384 KB

Cyln Head WPcom LZone Sect Size

Hard disk C: type : 47 =
Hard disk D: type : 40 820 6 820 820 17 41MB
Floppy drive A: : 1.44 MB, 3 1/2"
Floppy drive B: : 1.2 MB, 5 1/4"
Primary display : VGA/PGA/EGA
Keyboard : Installed

Month : Jan, Feb,.....Dec

Date : 01, 02, 03,...31
Year : 1901, 1902,...2099

USER TYPE 1224 16 1224 1224 36 330MB

Calendar

ESC:Exit ↓→↑←:Select F2/F3:Color PU/PD:Modify

The Standard CMOS Setup Screen

When you display the Standard CMOS Setup screen, the format is
similar to the sample shown above. If values display for all
parameters, the Setup parameters have been defined previously.

Setup detects and displays the Base memory and Extended memory
size values; these parameters cannot be reset by the user.

NOTE: The values in t his screen do not necessarily reflect the
values appro pr ia te f or your pr oc es sor boa r d. Refer to the explana­tions below for specific instructions about entering correct informa­tion.

TECHNICAL REFERENCE 4-1

STANDARD CMOS SETUP

STANDARD CMOS OPTIONS

The descriptions for the system options listed below show the values
as they appear if you have not run the Standard CMOS Setup pro­gram yet. Once val u e s ha ve been de f ined, they displa y each time
Standard CMOS Setup is run.

Date

The Setup screen displays the system option:

Date (mn/date/year) : Tue, Jan 01, 1980

The Help window displays allowable settings:

Month : Jan, Feb, ..... Dec

Date : 01, 02, 03, ....31

Year : 1901 , 1902,...2099

There are three fields for entering the date. Use the left and right
arrow keys to move from one field to another. As you scroll through
the month, date or year field, the day of the week changes automat­ically to reflect the new date.

Time

The Setup screen displays the system option:

Time (hour/min/sec) : 00 : 00 : 00

The Help window displays:

Time is 24 hour format:­Hour:(00-23), Minute:(00-59), Second:(00-59)
(1:30 AM = 01:30: 00), (1:30 PM = 13:30:00)

There are three fields for entering the time. Use the left and right
arrow keys to move from one field to another.

4-2 TECHNICAL REFERENCE

STANDARD CMOS SETUP

Hard Disk C: Type/Hard Disk D: Type

The Setup screen displays the system option:

Hard disk C: type : Not Installed

or

Hard disk D: type : Not Installed

The Help window displays:

FIXED type = 01...46, USER defined type = 47,
For type 47 Enter: Cyln, Head, WPcom, LZone, Sec ,
(WPcom is 0 for ALL, 65535 for NONE)

The Cyln, Head, WPcom, LZone, Sect and Size display as you
scroll through the disk types. Available drive types are listed at the
end of this section.

Not Installed is also available for use as an option. This option
could be used for diskless work stations and SCSI hard disks.

NOTE: If you have IDE drive( s) , the BIOS c a n au tom a tically detect
the disk type and parameters of each hard drive. This feature is ex­plained in the Running the CMOS Setup Programs section of this
manual.

To enter disk type parameters which are not preprogrammed, scroll
to type 47, which places the cursor at the Cyln entry. You can then
enter manually the Cyln, Head, WPcom, LZone and Sect parameters.
Type the correct value in each field and press <Enter>. The size is
automatically calculated and entered by the system based on the
other parameters entered.

The parameters for ty pe 47 unde r Hard disk C: and Hard disk D:
may be different, which effectively allows two different user­definable hard disk types.

TECHNICAL REFERENCE 4-3

STANDARD CMOS SETUP

The following explains the headings which appear on the Standard
CMOS Setup screen for the hard disk type entry:

Type is the numeric designation for a drive with certain iden­tification parameters.

Cyln is the number of disk cylinders found in the specified drive
type.
Head is the number of disk heads found in the specified drive
type.

WPcom is the read delay circuitry which takes into account the
timing differences between the inner and outer edges of the sur­face of the disk platter. The WPcom number designates the start­ing cylinder of the signal.

LZone is the disk cylinder where the head lands. This number
determines the cylinder location where the heads will normally
park when the system is shut down.

Sect designates the number of disk sectors per track. Every
track is normally divided into 17 sectors.

Size is the formatted capacity of the drive (in megabytes) based
on the following formula:

# of heads x # of cylinders x 17 se cts/cyln x 512 bytes/ sect

Floppy Drive A: Type/Floppy Drive B: Type

The Setup screen displays the system option:

Floppy drive A: : Not Installed

or

Floppy drive B: : Not Installed

4-4 TECHNICAL REFERENCE

STANDARD CMOS SETUP

The Help window displays:

Options:­360 KB 5-1/4", 1.2 MB 5-1/4", 720 KB 3-1/2",

1.44 KB 3-1/2", 2.88 MB 3-1/2", Not Installed

The Not Installed option can be used for diskless work stations.

Primary Display

The Setup screen displays the system option:

Primary display : Not Installed

The Help window displays:

Options:­Monochrome, Color 40x25,
VGA/PGA/EGA, Color 80x25, Not Installed

The Not Installed option can be used for network file servers.

Keyboard

The Setup screen displays the system option:

Keyboard : Not Installed

The Help window displays:

Options:­Installed : Test keyboard
Not Installed : Do not test keyboa rd

TECHNICAL REFERENCE 4-5

STANDARD CMOS SETUP

Saving and Exiting

When you have entered all of the appropriate information into the
Standard CMOS Setup screen, verify that it is correct.

Press <Esc> to return to the BIOS Setup Menu screen. This screen
allows you to save the changes you have just made or exit from
Setup without saving the changes.

4-6 TECHNICAL REFERENCE

STANDARD CMOS SETUP

USING A WORKSHEET FOR SETUP

Copy this worksheet to record the values needed for the initial
CMOS Setup program. Keep a copy in case of backup battery
failure. Cons ult your drive manua l if you are unsure about any o f
these values.

Hard Disk C: Type
** Cyln Head WPcom LZone Sect

Hard Disk D: Type
** Cyln Head WPcom LZone Sect

Floppy Drive A: Type

Floppy Drive B: Type

Primary Display

Keyboard

** Values required only if Type = 47 (USER-defined type)

TECHNICAL REFERENCE 4-7

STANDARD CMOS SETUP

FIXED DRIVE TYPES

Default fixed drive types defined in the standard BIOS are as follows:

Cyln = Cylinders per drive LZ = Landing zone
Head = Heads per drive Sect = Nbr of sectors per cylinde r
WPcom = Write precompensation Size = Tot al storage size (Megabytes)

(0 = all; 65535 = none)

Typ e Cyln Head WPcom LZ Sect Size
1 306 4 128 305 17 10

2 615 4 300 615 17 20
3 615 6 300 615 17 31
4 940 8 512 940 17 62
5 940 6 512 940 17 47
6 615 4 65535 615 17 20
7 462 8 256 511 17 31
8 733 5 65535 733 17 30
9 900 15 65535 901 17 112
10 820 3 65535 820 17 20
11 855 5 65535 855 17 35
12 855 7 65535 855 17 50
13 306 8 128 319 17 20
14 733 7 65535 733 17 43
15 ----- Invalid ----­ 16 612 4 0 663 17 20
17 977 5 300 977 17 41
18 977 7 65535 977 17 57
19 1024 7 512 1023 17 60
20 733 5 300 732 17 30
21 733 7 300 732 17 43
22 733 5 300 733 17 30
23 306 4 0 336 17 10
24 925 7 0 925 17 54
25 925 9 65535 925 17 69
26 754 7 754 754 17 44
27 754 11 65535 754 17 69
28 699 7 256 699 17 41
29 823 10 65535 823 17 68
30 918 7 918 918 17 53
31 1024 11 65535 1024 17 94
32 1024 15 65535 1024 17 128
33 1024 5 1024 1024 17 43
34 612 2 128 612 17 10
35 1024 9 65535 1024 17 77

4-8 TECHNICAL REFERENCE

STANDARD CMOS SETUP

FIXED DRIVE TYPES (continued)

Typ e Cyln Head WPcom LZ Sect Size
36 1024 8 512 1024 17 68

37 615 8 128 615 17 41
38 987 3 987 987 17 25
39 987 7 987 987 17 57
40 820 6 820 820 17 41
41 977 5 977 977 17 41
42 981 5 981 981 17 41
43 830 7 512 830 17 48
44 830 10 65535 830 17 69
45 917 15 65535 918 17 114
46 1224 15 65535 1223 17 152
47 ----- USER TYPE -----

TECHNICAL REFERENCE 4-9

STANDARD CMOS SETUP

This page intentionally left blank.

4-10 TECHNICAL REFERENCE

ADVANCED SETUP

ADVANCED SETUP

This section includes information on the operation of the Advanced
CMOS Setup and Adva nc e d Chi p Set Setup screens of t he BIOS.
The information for these screens is segmented into individual sec­tions for each processor board.

ADVANCED CMOS SETUP SCREEN

NOTE: The options on the Adva nc e d CM OS Se tup screens are

entirely chip set specific. The screens and options vary with the chip
set used on the particular processor board. Refer to the appropriate
section for your pr oc es sor boa rd fo r mor e i nf orma ti on. Typical selec­tions for these screens are shown below.

• Above 1 MB Memory Test

• Hit <DEL> Message Display

• Wait for <F1> If Any Error

• System Boot Up Num Lock

• Numeric Processor Test

• Floppy Drive Seek at Boot

• System Boot Up Sequence

• External Cache Memory

• Internal Cache Memory

• Password Checking Option

• Video ROM Shadow

• Adaptor ROM Shadow

• System ROM Shadow

• Boot Sector Virus Protection

TECHNICAL REFERENCE 5-1

ADVANCED SETUP

ADVANCED CHIP SET SETUP SCREEN

NOTE: The options on the Adva nc e d Chi p S et Setup screens are

entirely chip set specific. The screens and options vary with the chip
set used on the particular processor board. Refer to the appropriate
section for your pr oc es sor boa rd fo r mor e i nf orma ti on. The follow­ing types of options are included in this selection, depending on re­quirements for the specific chip set used.

• Bus Speed

• DMA Speed

• Memory Wait States

5-2 TECHNICAL REFERENCE

ADVANCED SETUP

ADVANCED CMOS SETUP - SB486T2C/66, SB486TC/50,
SB486TC/33 and SB486SXTC/33

When you enter Advanced CMOS Setup, the following Setup screen
appears:

BIOS SETUP PROGRAM - ADVANCED CMOS SETUP

(C)1992 American Megatrends Inc., All Rights Reserved

Above 1 MB Memory Test :Enable
Hit <DEL> Message Display :Enable
Wait For <F1> If Any Error :Enable
System Boot Up Num Lock :On
Numeric Processor Test :Enable
Floppy Drive Seek at Boot :Disable
System Boot Up Sequence :C:, A:
External Cache Memory :Enable
Internal Cache Memory :Enable
Password Checking Option :Setup
Video ROM Shadow C000,16K :Enable
Video ROM Shadow C400,16K :Enable
Adaptor ROM Shadow C800,16K :Disable
Adaptor ROM Shadow CC00,16K :Disable
Adaptor ROM Shadow D000,16K :Disable
Adaptor ROM Shadow D400,16K :Disable
Adaptor ROM Shadow D800,16K :Disable
Adaptor ROM Shadow DC00,16K :Disable

Adaptor ROM Shadow E000,16K :Disable
Adaptor ROM Shadow E400,16K :Disable
Adaptor ROM Shadow E800,16K :Disable
Adaptor ROM Shadow EC00,16K :Disable
System ROM Shadow F000,64K :Enable
Boot Sector Virus Protection :Disable

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ESC:Exit ↓→↑←:Sel (Ctrl ) Pu/Pd:Modify F1:Help F2/F3:Col or
F5:Old Values F6:BIOS Setup Defaults F7:Power-On Defaults

The Advanced CMOS Setup Screen

When you display the Advanced CMOS Setup screen, the format is
similar to the sample shown above. If values display for all
parameters, the Setup parameters have been defined previously.

NOTE: The values in t his screen do not necessarily reflect the
values appro pr ia te f or your pr oc es sor boa r d. Refer to the explana­tions below for specific instructions about entering correct informa­tion.

TECHNICAL REFERENCE 5-C4DX-1

ADVANCED SETUP

ADVANCED CMOS OPTIONS

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4

The descriptions for the system options listed below show the values

D

as they appear if you have not run the Advanced CMOS Setup pro-

X

gram yet. Once val u e s ha ve been de f ined, they displa y each time
Advanced CMOS Setup is run.

The Advanced CMOS Setup program is equipped with a series of
help screens which are accessed by pressing the <F1> key. Each
help screen displays the options available for a particular configura­tion feature and provides special help for some of the options.

Above 1 MB Memory Test

This option, when enabled, executes the POST memory routines on
the RAM above 1MB, if present on t he system. If the option is dis­abled, the BIOS checks only the first 1MB of RAM.

The Setup screen displays the system option:

Above 1MB Memory Test : Enabled

Available options are:

Disabled
Enabled

Hit <DEL> Message Display

The "Hit <DEL>, If you want to run SETUP" message displays
when the system boots up. Disabl ing this option p reve nts the mes­sage from displaying.

The Setup screen displays the system option:

Hit <DEL> Message Display : Enabled

5-C4DX-2 TECHNICAL REFERENCE

ADVANCED SETUP

Available options are:

Disabled
Enabled

Wait For <F1> If Any Error

Before the system boots up, the BIOS executes the Power-On Self
Test (POST) routines, a series of system diagnostic routines. If any
of these tests fail but the system can still function, a non-fatal error
has occurred. The BIOS re sponds with an appropria te error message
followed by:

Press <F1> to RESUME

If this option is disabled, a non-fatal error does not generate the
"Press <F1>" message, but the BIOS still displays the appropriate
error message. This eliminates the need for any user response to a
non-fatal err or condition messa ge. Non-fatal err or me ssa ges are
listed in Appendix A - BIOS Messages.

The Setup screen displays the system option:

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Wait For <F1> If Any Error : Enabled

Available options are:

Disabled
Enabled

System Boot Up Num Lock

This option enables you to turn off the Num Lock option on the en­hanced keyboard whe n the system is powere d on. If the Num Lock
is turned off, the arrow keys on the numeric keypad can be used, as
well as the other se t of arrow ke ys on the enhanced key boa r d. The
BIOS defaults to turning the Num Lock on.

TECHNICAL REFERENCE 5-C4DX-3

ADVANCED SETUP

The Setup screen displays the system option:

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System Boot Up Num Lock : On

Available options are:

On
Off

Numeric Processor Test

This option indicates whether or not the system should test for the
presence of the numeric processor.

The Setup screen displays the system option:

Numeric Processor Test : Enabled

Available options are:

Disabled
Enabled

Floppy Drive Seek at Boot

This option causes the system to have the floppy drive(s) seek during
bootup. The default for this option is Disabled to allow a fast boot
and to decrease the possibility of damage to the heads.

The Setup screen displays the system option:

Floppy Drive Seek at Boot : Disabled

Available options are:

Disabled
Enabled

5-C4DX-4 TECHNICAL REFERENCE

ADVANCED SETUP

System Boot Up Sequence

This option specifies the disk drive sequence the BIOS uses to search
for a bootabl e devi ce. The BIOS normally at te mpts to boot fro m
hard disk C: , i f pre se nt. If it is unsucc e ssf ul, it then at te mpts to boot
from floppy driv e A: . Thi s opt ion allows you to rever se the boot up
sequence.

The Setup screen displays the system option:

System Boot Up Sequence : C:, A:

The Help window displays:

Available Options are :­C:, A:
A:, C:
Press any key to cont inue

Specifying the standard DOS drive, typically C:, first speeds up the
bootup process.

For example, if you have hard drive C: and floppy drive A:,

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• Select C:, A: to seek hard drive C: first, then floppy

drive A:. This option speeds up the bootup process.

• Select A:, C: to seek floppy drive A: first, the n ha r d dr ive C: .

External Cache Memory

The external cache memory of the processor may be enabled or dis­abled using this option.

The Setup screen displays the system option:

External Cache Memory : Enabled

Available options are:

Disabled
Enabled

TECHNICAL REFERENCE 5-C4DX-5

ADVANCED SETUP

Internal Cache Memory

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4

The internal cache memory of the CPU may be enabled or disabled

D

using this option.

X

The Setup screen displays the system option:

Internal Cache Memory : Enabled

Available options are:

Disabled
Enabled

Password Checking Option

This option determines when a password is required for access to the
system.

The Setup screen displays the system option:

Password Checking Option : Setup

Two options are available:

• Select Setup to have the password prompt appear only when

an attempt is made to enter the System BIOS Setup program.

• Select Always to have the password prompt appear each

time the system is powered on.

NOTE: To disable password checking, a null password should be
entered in t he Change Password function of the BIOS Setup Men u.
(See the Running the CMOS Setup Programs section of this manual. )
The null password is the system default and is in effect if a password
has not been assigned or if the CMOS is corrupted.

5-C4DX-6 TECHNICAL REFERENCE

ADVANCED SETUP

Video or Adaptor ROM Shadow

ROM shadow is a technique in which BIOS code is copied from
slower ROM to faster RAM. The BIOS is then executed from the
RAM.

Each option allows for a segment of 16KB to be shadowed from
ROM to RAM. If one of these options is enabled, and there is BIOS
code present in that particular 16KB segment, the BIOS is shadowed.

Video ROM Shadow

Video BIOS shadowing may be done in 16KB increments at C000H
and C400H. Enabling shadowing can speed up the operation of a
machine because RAM can be accessed more rapidly than ROM and
the data bus is wider to RAM.

The Setup screen displays the system option:

Video ROM Shadow XXXX,16K : Enabled

where XXXX is the base address of the 16KB segment of
memory to be shadowed.

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Available options are:

Disabled
Enabled

Adaptor ROM Shadow

Other ROM’s may be shadowed in the memory area from C800H to
F000H, depending upon preferences and system requirements.

The Setup screen displays the system option:

Adaptor ROM Shadow XXXX,16K : Disabled

TECHNICAL REFERENCE 5-C4DX-7

ADVANCED SETUP

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Available options are:

X

where XXXX is the base address of the 16KB segment of
memory to be shadowed.

Disabled
Enabled

System ROM Shadow

This option, if enabled, shadows the entire System BIOS (64KB in
length).

The Setup screen displays the system option:

System ROM Shadow F000,64K : Enabled

Two options are available:

• Select Enabled for normal System BIOS shadow operation.

• Select Disabled to operate the System BIOS from ROM.

Boot Sector Virus Protection

This option, if enabled, write protects the disk boot sector.

The Setup screen displays the system option:

Boot Sector Virus Protection : Disabled

Available options are:

Disabled
Enabled

5-C4DX-8 TECHNICAL REFERENCE

ADVANCED SETUP

Saving and Exiting

When you have entered all of the appropriate information into the
Advanced CMOS Setup screen, verify that it is correct.

Press <Esc> to return to the BIOS Setup Menu screen. This screen
allows you to save the changes you have just made or exit from
Setup without saving the changes.

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TECHNICAL REFERENCE 5-C4DX-9

ADVANCED SETUP

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5-C4DX-10 TECHNICAL REFERENCE

ADVANCED SETUP

ADVANCED CHIP SET SETUP

When you enter Advanced Chip Set Setup, the following Setup
screen appears:

BIOS SETUP PROGRAM - ADVANCED CHIPSET SETUP

(C)1992 American Megatrends Inc., All Rights Reserved

Hidden Refresh :Enabled
AT Cycle Wait State :Disabled
AT Cycle Between I/O Cycles :6
AT BUS Clock Selection :CLKI/4
Non-Cacheable Block-1 Size :Disabled
Non-Cacheable Block-1 Base :0 KB
Non-Cacheable Block-2 Size :Disabled
Non-Cacheable Block-2 Base :0 KB
Video BIOS Area Cacheable :Yes

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ESC:Exit ↓→↑←:Sel (Ctrl ) Pu/Pd:Modify F1:Help F2/F3:Col or
F5:Old Values F6:BIOS Setup Defaults F7:Power-On Defaults

The Advanced Chip Set Setup Screen

When you display the Advanced Chip Set Setup screen, the format is
similar to the sample shown above. If values display for all
parameters, the Setup parameters have been defined previously.

NOTE: The values in t his screen do not necessarily reflect the
values appro pr ia te f or your pr oc es sor boa r d. Refer to the explana­tions below for specific instructions about entering correct informa­tion.

TECHNICAL REFERENCE 5-C4DX-11

ADVANCED SETUP

ADVANCED CHIP SET OPTIONS

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4

The descriptions for the system options listed below show the values

D

as they appear if you have not run the Advanced Chip Set Setup pro-

X

gram yet. Once val u e s ha ve been de f ined, they displa y each time
Advanced Chip Set Setup is run.

The Advanced Chip Set Setup program is equipped with a series of
help screens which are accessed by pressing the <F1> key. Each
help screen displays the options available for a particular configura­tion feature and provides special help for some of the options.

NOTE: Do not change the values fo r the op ti ons on this screen un-
less you understand the impact on system operation. Depending on
your system configuration, selection of other values may cause un­reliable system operation.

Hidden Refresh

This option allows the hidden refresh feature of the chip set to be dis­abled. Some option cards may no t ope r a te pr ope r ly with hidden
refresh enabled. For these cards, this feature should be set to Dis-
abled.

The Setup screen displays the system option:

Hidden Refresh : Enabled

Available options are:

Disabled
Enabled

AT Cycle Wait State

This option allows you to insert one Wait State in the standard AT
Bus cycle. F or reliable opera tion, it may be nece ssa r y to enable thi s
option if a Bus speed higher than the default is used.

5-C4DX-12 TECHNICAL REFERENCE

ADVANCED SETUP

The Setup screen displays the system option:

AT Cycle Wait State : Disabled

Available options are:

Disabled
Enabled

AT Cycle Between I/O Cycles

This option allows you to select the number of AT Bus clock cycles
between Bus I/O cycles. Bus performance may be increased in some
systems by selecting 2 in this option.

The Setup screen displays the system option:

AT Cycle Between I/O Cycles : 6

Available options are:

6
2

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X

AT BUS Clock Selection

This option allows you to select the source of the AT Bus clock. The
actual frequency of the Bus clock is developed by dividing the fre­quency of the selected clock (CLKI or CLK2I) by the divisor
specified in the selection. Clock frequencies are as follows:

CLKI CLK2I

Processor Default Frequency Frequency
66MHz 486DX2 CLKI/4 33MHz 66MHz
50MHz 486DX CLKI/6 50MHz 50MHz
33MHz 486DX CLKI/4 33MHz 66MHz
33MHz 486SX CLKI/4 33MHz 66MHz

TECHNICAL REFERENCE 5-C4DX-13

ADVANCED SETUP

The Setup screen displays the system option:

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X

AT BUS Clock Selection : CLKI/X

where X is the div isor by which the clo ck is divided. The
default divisor varies depending on your processor board, as
noted above.

Available options are:

CLKI/6
CLKI/4
CLKI/3
CLK2I/5

Non-Cacheable Blocks

Two non-cacheable blocks may be configured in system memory.
These blocks are typically used to prevent cacheing an area of
memory which i s ma ppe d to an option ca rd . Ther e i s a pai r of
registers for each non-cacheable block. The first register specifies
the size of the non-cacheable block, which may be disabled or set to
64KB, 128KB, 256KB or 512KB. The second registe r is the base ad­dress, which can be set in increments of the block size selected in the
first register in the pair.

The Setup screen displays the system options:

Non-Cacheable Block-X Size : Disabled
Non-Cacheable Block-X Base : 0 KB

where X is the number of the non-cacheable block.

Available options for block size are:

Disabled
64 KB
128 KB
256 KB
512 KB

5-C4DX-14 TECHNICAL REFERENCE

ADVANCED SETUP

Video BIOS Area Cacheable

This option allows caching of the video BIOS area of memory. The
option is valid only if the video BIOS is shadowed.

The Setup screen displays the system option:

Video BIOS Area Cache : Yes

Available options are:

Yes
No

Saving and Exiting

When you have entered all of the appropriate information into the
Advanced Chip Set Setup screen, verify that it is correct.

Press <Esc> to return to the BIOS Setup Menu screen. This screen
allows you to save the changes you have just made or exit from
Setup without saving the changes.

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TECHNICAL REFERENCE 5-C4DX-15

ADVANCED SETUP

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This page intentionally left blank.

5-C4DX-16 TECHNICAL REFERENCE

ADVANCED SETUP

ADVANCED CMOS SETUP - SB386SX/25

When you enter Advanced CMOS Setup, the following Setup screen
appears:

BIOS SETUP PROGRAM - ADVANCED CMOS SETUP

(C)1990 American Megatrends Inc., All Rights Reserved

Above 1 MB Memory Test :Disable
Hit <DEL> Message Display :Enable
Wait For <F1> If Any Error :Enable
System Boot Up Num Lock :On
Numeric Processor Test :Enable
Floppy Drive Seek At Boot :Disable
System Boot Up Sequence :C:, A:
Password Checking Option :Setup
Video ROM Shadow C000,32K :Enable
Adaptor ROM Shadow C800,32K :Disable
Adaptor ROM Shadow D000,32K :Disable
Adaptor ROM Shadow D800,32K :Disable
Adaptor ROM Shadow E000,32K :Disable
Adaptor ROM Shadow E800,32K :Disable
System ROM Shadow F000,64K :Enable

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X

ESC:Exit ↓→↑←:Sel (Ctrl ) Pu/Pd:Modify F1:Help F2/F3:Col or
F5:Old Values F6:BIOS Setup Defaults F7:Power-On Defaults

The Advanced CMOS Setup Screen

When you display the Advanced CMOS Setup screen, the format is
similar to the sample shown above. If values display for all
parameters, the Setup parameters have been defined previously.

NOTE: The values in t his screen do not necessarily reflect the
values appro pr ia te f or your pr oc es sor boa r d. Refer to the explana­tions below for specific instructions about entering correct informa­tion

TECHNICAL REFERENCE 5-C3SX-1

ADVANCED SETUP

ADVANCED CMOS OPTIONS

C

3

The descriptions for the system options listed below show the values

S

as they appear if you have not run the Advanced CMOS Setup pro-

X

gram yet. Once val u e s ha ve been de f ined, they displa y each time
Advanced CMOS Setup is run.

The Advanced CMOS Setup program is equipped with a series of
help screens which are accessed by pressing the <F1> key. Each
help screen displays the options available for a particular configura­tion feature and provides special help for some of the options.

Above 1 MB Memory Test

This option, when enabled, executes the POST memory routines on
the RAM above 1MB, if present on t he system. If the option is dis­abled, the BIOS checks only the first 1MB of RAM.

The Setup screen displays the system option:

Above 1MB Memory Test : Disabled

Available options are:

Disabled
Enabled

Hit <DEL> Message Display

The "Hit <DEL>, If you want to run SETUP" message displays
when the system boots up. Disabl ing this option p reve nts the mes­sage from displaying.

The Setup screen displays the system option:

Hit <DEL> Message Display : Enabled

5-C3SX-2 TECHNICAL REFERENCE

ADVANCED SETUP

Available options are:

Disabled
Enabled

Wait For <F1> If Any Error

Before the system boots up, the BIOS executes the Power-On Self
Test (POST) routines, a series of system diagnostic routines. If any
of these tests fail but the system can still function, a non-fatal error
has occurred. The BIOS re sponds with an appropria te error message
followed by:

Press <F1> to RESUME

If this option is disabled, a non-fatal error does not generate the
"Press <F1>" message, but the BIOS still displays the appropriate
error message. This eliminates the need for any user response to a
non-fatal err or condition messa ge. Non-fatal err or me ssa ges are
listed in Appendix A - BIOS Messages.

The Setup screen displays the system option:

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X

Wait For <F1> If Any Error : Enabled

Available options are:

Disabled
Enabled

System Boot Up Num Lock

This option enables you to turn off the Num Lock option on the en­hanced keyboard whe n the system is powere d on. If the Num Lock
is turned off, the arrow keys on the numeric keypad can be used, as
well as the other se t of arrow ke ys on the enhanced key boa r d. The
BIOS defaults to turning the Num Lock on.

TECHNICAL REFERENCE 5-C3SX-3

ADVANCED SETUP

The Setup screen displays the system option:

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System Boot Up Num Lock : On

Available options are:

On
Off

Numeric Processor Test

This option indicates whether or not the system should test for the
presence of the numeric processor.

The Setup screen displays the system option:

Numeric Processor Test : Enabled

Available options are:

Disabled
Enabled

Floppy Drive Seek at Boot

This option causes the system to have the floppy drive(s) seek during
bootup. The default for this option is Disabled to allow a fast boot
and to decrease the possibility of damage to the heads.

The Setup screen displays the system option:

Floppy Drive Seek at Boot : Disabled

Available options are:

Disabled
Enabled

5-C3SX-4 TECHNICAL REFERENCE