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versa 2000
schematic
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NEC versa 2000 schematic

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VERSA 2000 (RT1)
SERVICE AND REFERENCE MANUAL
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PROPRIETARY NOTICE AND LIABILITY DISCLAIMER
The information disclosed in this document, including all designs and related materials, is the valuable property of NEC Corporation (NEC) and/or its licensors. NEC and/or its licensors, as appropriate, reserve all patent, copyright and other proprietary rights to this document, including all design, manufacturing, reproduction, use, and sales rights thereto, except to the extent said rights are expressly granted to others.
The NEC product(s) discussed in this document are warranted in accordance with the terms of the Warranty Statement accompanying each product. However, actual performance of each such product is dependent upon factors such as system configuration, customer data, and operator control. Since implementation by customers of each product may vary, the suitability of specific product configurations and applications must be determined by the customer and is not warranted by NEC.
To allow for design and specification improvements, the information in this document is subject to change at any time, without notice. Reproduction of this document or portions thereof without prior written approval of NEC is prohibited.
FastFacts, and NEC SVGA, are U.S. trademarks of NEC Technologies, Inc. All other product, brand, or trade names used in this publication are the trademarks or registered
trademarks of their respective trademark owners.
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Preface............................................................................................................................. vii
Abbreviations .................................................................................................................. ix
Section 1 Technical Information
Hardware Overview......................................................................................................... 1-2
Liquid Crystal Display (LCD).................................................................................. 1-3
System Board ........................................................................................................... 1-3
Battery Pack ............................................................................................................. 1-4
CMOS Battery.......................................................................................................... 1-4
Bridge Battery.......................................................................................................... 1-4
PCMCIA Slots.......................................................................................................... 1-4
Keyboard.................................................................................................................. 1-4
NEC VersaGlide....................................................................................................... 1-5
System Memory............................................................................................................... 1-5
Memory Map............................................................................................................ 1-6
System Video................................................................................................................... 1-7
Parallel Interface.............................................................................................................. 1-11
Serial Interface................................................................................................................. 1-11
NEC Versa 2000 Series Chip Set.................................................................................... 1-11
System Logic............................................................................................................ 1-12
Flash ROM............................................................................................................... 1-12
ROM BIOS........................................................................................................ 1-12
Peripheral Controller................................................................................................ 1-13
VGA Controller........................................................................................................ 1-13
Video Controller Architecture........................................................................... 1-13
Diskette Controller, Serial Interface, Parallel Interface ........................................... 1-14
Keyboard Controller................................................................................................. 1-14
PCMCIA Controller................................................................................................. 1-14
I/O Addressing ......................................................................................................... 1-15
Interrupt Controllers................................................................................................. 1-16
Power Management Overview ........................................................................................ 1-17
System Power Management..................................................................................... 1-17
Local Power Management........................................................................................ 1-17
Plug and Play................................................................................................................... 1-18
Specifications .................................................................................................................. 1-19
Section 2 Setup and Operation
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Unpacking the System..................................................................................................... 2-1
Setup................................................................................................................................ 2-1
Cable Connections.................................................................................................... 2-2
Operating Controls .......................................................................................................... 2-3
LEDs......................................................................................................................... 2-4
Function Keys (Fn Keys).......................................................................................... 2-5
CMOS Clear Switch and Keyboard Switch............................................................. 2-6
Smart Power Switch................................................................................................. 2-7
Power-on Self-Test (Post) ............................................................................................... 2-7
POST Errors............................................................................................................. 2-8
System Parameters........................................................................................................... 2-9
Auto Setup................................................................................................................ 2-9
Accessing Auto Setup .............................................................................................. 2-9
Auto Setup Keys ............................................................................................... 2-10
Auto Setup Parameter Options........................................................................................ 2-11
Parameter Descriptions ............................................................................................ 2-12
Comms.............................................................................................................. 2-12
Drives................................................................................................................ 2-12
Keyboard........................................................................................................... 2-12
Power ................................................................................................................ 2-13
System............................................................................................................... 2-13
Time/Date.......................................................................................................... 2-14
Using Auto Setup to Select Parameters........................................................................... 2-14
Security Options.............................................................................................................. 2-15
System Password...................................................................................................... 2-15
Using the System Password.............................................................................. 2-15
Keyboard Lock Hotkey............................................................................................ 2-16
NEC Utilities................................................................................................................... 2-17
BIOS Update Utility (BUU)..................................................................................... 2-17
Precautions........................................................................................................ 2-17
Downloading the Update Utility....................................................................... 2-18
Using the Update Utility................................................................................... 2-18
Menu Functions................................................................................................. 2-20
Power Sources................................................................................................................. 2-24
AC Adapter .............................................................................................................. 2-24
Battery Power........................................................................................................... 2-25
Recharging the Battery Pack............................................................................. 2-26
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Replacing the Battery Pack.............................................................................................. 2-26
Saving Battery Power............................................................................................... 2-27
Automatic Power-Saving Features.................................................................................. 2-28
Power Saving Levels................................................................................................ 2-28
Active Mode...................................................................................................... 2-28
Suspend Mode................................................................................................... 2-28
Section 3 Illustrated Parts Breakdown
Appendix A Connector Locations and Pin Assignments
List of Figures
1-1 Versa 2000 Series (Right Side View) ............................................................... 1-1
1-2 Versa 2000 Series (Left Side View).................................................................. 1-2
1-3 Versa 2000 Series (Rear View)......................................................................... 1-3
2-1 Power and I/O Connector Locations................................................................. 2-2
2-2 Control and Switch Locations........................................................................... 2-3
2-3 CMOS Clear and Keyboard Switch Locations ................................................. 2-6
2-4 Connecting the AC Adapter.............................................................................. 2-25
2-5 Battery Release Latch Location......................................................................... 2-26
2-6 Battery Pack Replacement ................................................................................ 2-27
3-1 Illustrated Parts Breakdown.............................................................................. 3-4
A-1 System Board Connector Locations.................................................................. A-1
List of Tables
1-1 Versa 2000 Series Memory Map....................................................................... 1-6
1-2 CRT Display Mode (CRT only)........................................................................ 1-7
1-3 LCD Display Modes (640 x 480 TFT, Simultaneous CRT)............................. 1-9
1-4 LCD Display Modes (640 x 480 DSTN, Simultaneous CRT).......................... 1-10
1-5 Versa 2000 Series Chip Types and Technologies............................................. 1-11
1-6 Versa 2000 Series I/O Address Map................................................................. 1-15
1-7 Versa 2000 Series Interrupt Level Assignments............................................... 1-16
1-8 Specifications.................................................................................................... 1-19
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2-1 I/O Connector Descriptions............................................................................... 2-2
2-2 Control and Switch Functions........................................................................... 2-4
2-3 FnKey Operations ............................................................................................. 2-5
2-4 POST Error Messages....................................................................................... 2-8
2-5 Auto Setup Key Functions................................................................................ 2-10
2-6 Auto Setup Parameter Options.......................................................................... 2-11
2-7 Automatic Power-Saving Features.................................................................... 2-28
3-1 Versa 2000 Series Field-Replaceable Parts....................................................... 3-1
3-2 Option and Documentation Part Numbers........................................................ 3-5
A-1 System Board Connectors................................................................................. A-1
A-2 Keyboard/Mouse Connector Pin Assignments................................................. A-2
A-3 Serial Port Connector Pin Assignments............................................................ A-3
A-4 CRT Connector Pin Assignments..................................................................... A-3
A-5 Parallel Printer Pin Assignments....................................................................... A-4
A-6 Docking Connector Pin Assignments............................................................... A-5
A-7 Power Connector............................................................................................... A-9
A-8 Hard Disk Drive Connector ..............................................................................A-10
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Preface
This service and reference manual contains the technical information necessary to set up, and maintain the NEC Versa™ 2000 Series Notebook systems. It also provides hardware and interface information for users who need an overview of the computer system design. The manual is written for NEC-trained customer engineers, system analysts, service center personnel, and dealers.
Please refer to the training module provided on CD-ROM for disassembly/assembly procedures.
The manual is organized as follows:
Section 1
components. System specifications are listed including computer dimensions, weight, environment, safety compliance, power consumption, and system memory specifications.
Section 2
The section includes a description of operating controls, setting parameters and accessing the NEC bulletin board system (BBS).
Section 3
the Versa 2000 series system and part numbers.
Appendix A
board internal connector pin assignments and a list of external pin assignments. An
Index
Technical Information

Setup and Operation,
Illustrated Parts Breakdown (IPB),
Connector Locations and Pin Assignments,
is included for convenience.
, provides an overview of the hardware and interface
takes the user from unpacking to setup and operation.
provides an exploded-view diagram of
provides a list of the main
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Abbreviations
A ampere AC alternating current AT advanced technology
(IBM PC) BBS Bulletin Board System BCD binary-coded decimal BCU BIOS Customized Utility BIOS basic input/output system bit binary digit bpi bits per inch bps bits per second BUU BIOS Upgrade Utility C centigrade Cache high-speed buffer storage CAM constantly addressable memory CAS column address strobe CD-ROM compact disk-ROM CGA Color Graphics Adapter CGB Color Graphics Board CH channel clk clock cm centimeter CMOS complementary metal oxide semiconductor COM communication CONT contrast CPGA ceramic pin grid array CPU central processing unit CRT cathode-ray tube DAC digital-to-analog converter DACK DMA acknowledge DC direct current DIP dual in-line package DLAB Divisor Latch Address bit DMA direct memory access DMAC DMA controller DOS disk operating system
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DRAM dynamic RAM DTE data terminal equipment ECC error checking and correction EDS error detecting system EGA Enhanced Graphics Adapter EMS Expanded Memory Specification EPP enhanced parallel port EPROM erasable and programmable ROM EVGA Enhanced Video Graphics Array F Fahrenheit FAX facsimile transmission FCC Federal Communications Commission FG frame ground FM frequency modulation Fn Function FRU field-replaceable unit GB gigabyte GND ground HDD hard diskdrive HEX hexadecimal HGA Hercules Graphics Adapter Hz hertz IC integrated circuit ID identification IDE intelligent device electronics IDTR interrupt descriptor table register IMR Interrupt Mask register in. inch INTA interrupt acknowledge IPB illustrated parts breakdown IRR Interrupt Request register ISA Industry Standard Architecture ISR In Service register I/O input/output IPC integrated peripheral controller ips inches per second IRQ interrupt request
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K kilo (1024) k kilo (1000) KB kilobyte kg kilogram kHz kilohertz kV kilovolt lb pound LDTR local descriptor table register LED light-emitting diode LSB least-significant bit LSI large-scale integration M mega mA milliamps max maximum MB megabyte MDA Monochrome Display Adapter MFM modified frequency modulation Mhz megahertz mm millimeter ms millisecond MSB most-significant bit NASC National Authorized Service Center NC not connected NDP numeric data processor NMI Non-maskable Interrupt ns nanosecond NSRC National Service Response Center PAL programmable array logic PC personal computer PCB printed circuit board PFP plastic flat package PIO parallel input/output pixel picture element PJQFP plastic J-lead quad flat pack PLCC plastic lead chip carrier PLL phase lock loop p-p peak-to-peak
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PPI programmable peripheral interface PROM programmable ROM QFP quad flat pack RAM random-access memory RAMDAC RAM digital-to-analog RAS row address strobe RGB red green blue RGBI red green blue intensity ROM read-only memory rpm revolutions per minute R read RTC real-time clock R/W read/write S slave SCSI Small Computer System Interface SDLC Synchronous Data Link Control SG signal ground SIMM single inline memory module SQFP silver quad flat package SVGA Super Video Graphics Array SW switch TAC Technical Assistance Center TCP Thin chip package TQFP Thin-quad flat package TSC Technical Support Center TTL transistor/transistor logic tpi tracks per inch UART universal asynchronous receiver/transmitter V volt Vdc volts, direct current VESA video electronics standards association VFO variable frequency oscillator VGA Video Graphics Array VLSI very large-scale integration VRAM virtual RAM W watt W write
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f microfarad
µ
PD microprocessor
µ
s microsecond
µ
ohm
Ω
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Section 1
Technical Information
The NEC Versa 2000 series computers integrate the Intel® 486 DX4-75 chip. The systems offer a unique transportable unit in the following configurations:
NEC Versa 2000C  75-MHz CPU, 350-MB hard disk drive, 9.5-inch thin-film
!"
transistor (TFT) color LCD, 4-MB standard RAM, 1-MB video memory, 256-KB ROM, no modem
NEC Versa 2000C  75-MHz CPU, 350-MB hard disk drive, 9.5-inch thin-film
!"
transistor (TFT) color LCD, 8-MB standard RAM, 1-MB video memory, 256-KB ROM, 14.4K bps data fax/modem
NEC Versa 2000C  75-MHz CPU, 540-MB hard disk drive, 9.5-inch thin-film
!"
transistor (TFT) color LCD, 8-MB standard RAM, 1-MB video memory, 256-KB ROM, 14.4K bps fax/modem
NEC Versa 2000D  75-MHz CPU, 350-MB hard disk drive, 10.4-inch Dual-
!"
scan Super Twisted Nematic (DSTN) color LCD, 4-MB standard RAM, 1-MB video memory, 256-KB ROM, no modem
Figure Section 2-1 and Figure Section 2-2 show system features.
Figure Section 2-1 Versa 2000 Series (Right Side View)
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Figure Section 2-2 Versa 2000 Series (Left Side View)

HARDWARE OVERVIEW

The base unit includes a color LCD panel, a 2 1/2-inch 350-MB, or 540-MB hard disk drive, a 3 1/2-inch, 1.44-MB diskette drive, a battery pack, and a PS/2 compatible 83-key keyboard. A 79-key keyboard is used for U.K. and Germany.
Two memory cards slot are available for the addition of a 4-, 8- or 16-MB capacity memory card. Two Personal Computer Memory Card International Association (PCMCIA) card slots, supported by the Cirrus Logic CL-PD6720 PCMCIA controller, allow for the addition of either two PCMCIA Type 1/Type II cards or one PCMCIA Type III card.
Figure Section 2-3 shows the standard I/O interface ports on the system's rear panel. These include one 6-pin shared PS/2-style keyboard/mouse port, one 9-pin (RS-232C) serial port, one 25-pin enhanced printer (parallel) port, one docking connector, one 15-pin Super VGA CRT port, and one 3-pin power connector port.
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Figure Section 2-3 Versa 2000 Series (Rear View)

Liquid Crystal Display (LCD)

The system integrates a built-in LCD. The LCD supports VESA Local (VL) bus video. The LCD operates with the Chips & Technologies 65545B1-5 VGA controller. The controller supports Super VGA. For more information on the 65545B1-5 VGA controller, read the description provided in the Versa 2000 Series Chip Set subsection.
The Versa 2000 series system features the following types of LCDs.
TFT — 9.5-inch thin-film transistor backlit color LCD, 0.3 mm dot pitch, 12-bit
!"
digital interface, 640 x 480 resolution, 4,096 colors, (64K colors on an external CRT).
DSTN — 10.4-inch dual-scan super twisted nematic color LCD, 0.3 mm dot
!"
pitch, 12-bit digital interface, 600 x 480 resolution, (64K colors on an external CRT).
In addition, the CRT port on the system's rear panel allows the user to connect an optional monochrome or color external display to the system. The computer supports the LCD and external display simultaneously.
Power-saving features for controlling the LCD's backlighting include the ROM-based hot key Fn F5, and Auto Setup power management settings. See Section 2, Setup and Operation, for information on using these settings. In addition, the automatic LCD status sense feature conserves the backlight. When the LCD is closed the backlight shuts off, saving battery power.
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System Board

The system board (G8TZL) is the primary component in the system. It contains I/O subsystems and houses the Intel® 486 DX4-75 chip (75 Mhz internal, 50 Mhz external). The chip controls important functions including power management, direct drive bus interface and memory management.
System board specifications are listed in Table Section 2-8 at the end of this section.

Battery Pack

The system uses a rechargeable lithium-ion (Li-ION) battery as its transient power source. The battery pack installs in the compartment next to the diskette drive assembly. The battery uses 14.4 volts with a 2700 mAh capacity.
The battery pack powers the Versa 2000 for up to approximately four hours under power management, and two hours without power management. In addition, the battery pack lets the user know how much battery power is available via the LEDs on the front of the system, or the battery gas gauge in Windows.
When battery power is getting low, connect the AC adapter to a wall outlet and recharge the battery. It takes 1.6 hours to recharge the battery pack when the system is powered off. It takes 6 to 9 hours to recharge the battery while the system is powered on.

CMOS Battery

The lithium battery (3.6 Volts, 1000 mAh capacity) is connected to CN17A on the system board. It provides battery backup and prevents data loss in the system’s complementary metal oxide semiconductor (CMOS) RAM. This memory area contains information on the system’s configuration like date, time, drives, and memory. The CMOS battery lasts approximately two years.

Bridge Battery

The bridge battery saves the memory contents and system status for up to 5 minutes while in Suspend mode. It is connected to the system board via CN 13. The AC adapter maintains voltage in the bridge battery when the system is powered on or off. The bridge battery provides 10 Volts, 30 mAH.

PCMCIA Slots

The Versa 2000 provides a 3.3 volt interface for either two Type I/Type II PCMCIA cards, or one Type III PCMCIA card.
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Keyboard

The built-in, 83-key keyboard (U.S) or 79-key keyboard (UK and Germany) uses the standard QWERTY format. The keyboard provides 12 function keys and 8 cursor control keys, with an Fn key for ROM-based key functions. The numeric keypad is embedded in the standard key layout.

NEC VersaGlide

The NEC VersaGlide is a built-in mechanism that functions as the system’s mouse. It controls the on-screen pointer (cursor). To use the VersaGlide, glide your finger across the NEC VersaGlide pad, and the cursor follows. The buttons on either side of the NEC VersaGlide allow the user to select or deselect menu items. Double-tap is also supported on the VersaGlide pad.
The NEC VersaGlide is the system's default pointing device unless a PS/2 mouse is installed. If an external mouse is installed, then the NEC VersaGlide is deactivated. A serial mouse is not supported.

SYSTEM MEMORY

The system board provides either 4- or 8-MB of standard random access memory (RAM). Base memory is 640 KB and extended memory is 3072 or 7168 KB (interleaved), depending on the system model.
Optional memory cards with a value of 4-, 8-, or 16-MB can be added to increase system memory up to a maximum of 36- or 40-MB. In addition, 256 KB of read-only memory (ROM), 1 x 28F020, enables the system BIOS to be flashed.
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Memory Map

The system supports system and video shadowing, both controlled through complementary metal oxide semiconductor (CMOS). The system supports BIOS as a cacheable area with write protection. Table Section 2-1 lists the system's memory map.
To view a more complete breakdown, and to determine available space for the addition of drivers etc., type
Table Section 2-1 Versa 2000 Series System Memory Map
Memory Space Size Function
at the DOS prompt and press
MSD
Enter
.
017FFFFFh­01400000h
017FFFFFh­01000000h
00FFFFFFh­00C0000h
00BFFFFFh­00400000h
003FFFFFh­00100000h
000FFFFFh­000E0000h
000DFFFFh­000D0000h
000BFFFFh­000A0000h
0009FFFFh­000C0000h
24 MB Reserved for Extended Memory
20 MB
16 MB
8 MB
4 MB
128KB
128 KB Video Memory
Reserved for Extended Memory
Reserved for Extended Memory
Base Memory
Base Memory
ROM BIOS Low System & Video
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SYSTEM VIDEO

The system's LCD operates using the Chips and Technologies 65545B1-5 VGA Controller. Video signals travel from the controller through the system's 15-pin D-SUB connector using 5 volts.
System video integrates a 32-bit VL-bus interface using local bus video. The system ships with 1 MB Video RAM (VRAM). It also supports video modes up to 1024 x 768 with 256 colors in CRT mode.
Table Section 2-2 lists CRT display modes..
NOTE:
Interlaced video modes are represented
with the letter I in the table below.
Table Section 2-2 CRT Display Mode (CRT only)
Mode (Hex)
0, 1 Text 16 40x25 320x200 8x8 70 0*, 1* Text 16 40x25 320x200 8x14 70 0**, 1** Text 16 40x25 360x400 9x16 70 2*, 3* Text 16 80x25 640x200 8x8 70 2**, 3** Text 16 80x25 720x400 9x16 70 4,5* Graphics 4 40x25 320x200 8x8 70 6 Graphics 2 80x25 640x200 8x8 70 7* Text Mono 80x25 720x350 9x14 70 7** Text Mono 80x25 720x400 9x16 70 D Planar 16 40x25 320x200 8x8 70
Display Mode
Colors
Text Display Resolution Font
Refresh Rate
E Planar 16 80x25 640x200 8x8 70 F Planar Mono 80x25 640x350 8x14 70 10 Planar 16 80x25 640x350 8x14 70 11 Planar 2 80x30 6400x480 8x16 60 12 Planar 16 80x30 640x480 8x16 60 12*** Planar 16 80x30 640x480 8x16 75 13 Packed
Pixel 20 4-bit linear 16 80x30 640x480 8x16 60 22 4-bit linear 16 100x37 800x600 8x16 60
256 40x25 320x200 8x8 70
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Table Section 2-2 CRT Display Mode (CRT only)
Mode (Hex)
24 4-bit linear 16 128x48 1024x768 8x16 60 24I 4-bit linear 16 128x48 1024x768 8x16 43 30 8-bit linear 256 80x30 640x480 8x16 60 30*** 8-bit linear 256 80x30 640x480 8x16 75 32 8-bit linear 256 100x37 800x600 8x16 60 32*** 8-bit linear 256 100x37 800x600 8x16 75 34 8-bit linear 256 128x48 1024x768 8x16 60 34I 8-bit linear 256 128x48 1024x768 8x16 43 40 15-bit
41 16-bit
60 Text 16 132x25 1056x400 8x16 68 61 Text 16 132x50 1056x400 8x16 68 6A, 70 Planar 16 100x37 800x600 8x16 60
Display
Mode
linear
linear
Colors
32K 80x30 640x480 8x16 60
64K 80x30 640x480 8x16 60
Text Display Resolution Font
Refresh Rate
6A*** 70*** Planar 16 100x37 800x600 8x16 74 72, 75 Planar 16 128x48 1024x768 8x16 60 72I, 75I Planar 16 128x48 1024x768 8x16 43 78 Packed
Pixel 79 Packed
Pixel 79*** Packed
Pixel 7C Packed
Pixel 7C*** Packed
Pixel
*EGA Extension **VGA Extension ***High Refresh Modes
256 80x25 640x400 8x16 70
256 80x30 640x480 8x16 60
256 80x30 640x480 8x16 74
256 100x37 800x600 8x16 60
256 100x37 800x600 8x16 75
Table Section 2-3 lists 640 x 480, TFT simultaneous LCD/CRT display modes.
Table Section 2-3 LCD Display Modes (640 x 480 TFT, Si multaneous CRT)
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Mode (Hex)
0,1 Text 16 40x25 320x200 8x8 60 2,3 Text 16 80x25 640x200 8x8 60 0*, 1* Text 16 40x25 320x350 8x14 60 2*, 3* Text 16 80x25 640x350 8x14 60 0**, 1** Text 16 40x25 320.x4000 8x16 60 2**, 3** Text 16 80x25 640x400 8x16 60 4, 5 Graphics 4 40x25 320x200 8x8 60 6 Graphics 2 80x25 640x200 8x8 60 7* Text Mono 80x25 640x350 8x14 60 7** Text Mono 80x25 640x400 8x16 60 D Planar 16 40x25 320x200 8x8 60 E Planar 16 80x25 640x200 8x8 60
F Planar Mono 80x25 640x350 8x14 60 10 Planar 16 80x25 640x350 8x14 60
11 Planar 2 80x30 640x480 8x16 60
Display Mode Colors
Text Display Resolution Font
Refresh Rate
12 Planar 16 80x30 640x480 8x16 60 13 Packed
Pixel
20 4-bit
linear
30 8-bit
linear
40 15-bit
linear
41 16-bit
linear
78 Packed
Pixel
*EGA Extension **VGA Extension
256 40x25 320x200 8x8 60
16 80x30 640x480 8x16 60
256 80x30 640x480 8x16 60
32K 80x30 640x480 8x16 60
64K 80x30 540x480 8x16 60
256 80x25 640x400 8x16 60
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Table Section 2-4 lists LCD display modes, 640 x 480 DSTN, simultaneous CRT display modes.
Table Section 2-4 LCD Display Mode (640 x 480 DSTN, Si multaneous CRT Display)
Mode (Hex)
0, 1 Text 16 40x25 320x200 8x8 60 2, 3 Text 16 80x25 640x200 8x8 60 0*, 1* Text 16 40x25 320x350 8x14 60 2*, 3* Text 16 80x25 640x350 8x14 60 0**, 1** Text 16 40x25 320x400 8x16 60
2**, 3** Text 16 80x25 640x400 8x16 60 4,5 Graphics 4 40x25 320x200 8x8 60 6 Graphics 2 80x25 640x200 8x8 60
7* Text Mono 80x25 640x350 8x14 60 7** Text Mono 80x25 640x400 8x16 60 D Planar 16 40x25 320x200 8x8 60 E Planar 16 80x25 640x200 8x8 60 F Planar Mono 80x25 640x350 8x14 60 10 Planar 16 80x25 640x350 8x14 60
Display Mode Colors
Text Display Resolution Font
Refesh Rate
11 Planar 2 80x30 640x480 8x16 60 12 Planar 16 80x30 640x480 8x16 60 13 Packed
Pixel
20 4-bit
linear
30 8-bit
linear
78 Packed
Pixel
79 Packed
Pixel
*EGA Extension **VGA Extension
256 40x25 320x200 8x8 60
16 80x30 640x480 8x16 60
256 80x30 640x480 8x16 60
256 80x25 640x400 8x16 60
256 80x30 640x480 8x16 60
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PARALLEL INTERFACE

The system's parallel interface integrates National’s PC87334 chip. It uses a 25-pin D­subconnector that is Enhanced Capabilities Port (ECP) equipped. The port is located on the system's rear panel.
The user selects between three parallel interface modes using Auto Setup. These include unidirectional, bidirectional or enhanced. Unidirectional mode sends data output from the standard ISA port only. Bidirectional mode sends data using the standard ISA port or PS/2 technology. Enhanced mode enables high speed data transmission to occur using either the unidirectional or bidirectional modes.
The parallel port address is 378h and the interrupt level is IRQ07. Pin locations for the parallel interface are listed in Appendix A.

SERIAL INTERFACE

The RS-232C serial port is a 9-pin connector on the system’s rear panel. The serial port consists of a 16550 compatible serial port controller with a program.
able baud rate within 50/56000 bps. The serial port connects an RS-232C device or an external modem. The serial port address is 3F8h and the interrupt level is IRQ04.

NEC VERSA 2000 SERIES CHIP SET

Refer to Table Section 2-5 for a quick summary of the chip types used in the system. See the Abbreviations section at the beginning of this manual for a translation of chip technologies.
Table Section 2-5
Chip Manufacturer Description Technology
P24C Intel 75 MHz CPU 208-pin SQFP PT86C786 or
Sequoia-1 PT86C768A2 PT86C718 Pico Power IDE Interface, Peripheral
N28F020-150 Intel 256k x 8 Flash ROM 32-pin PLCC C&T65545B1-5 Chips &
Versa 2000 Series Chip Types and Technologies
____
Pico Power System Logic 176-pin TQFP
176-pin TQFP Controller, Interrupt Multiplexer
VGA Controller 208-pin QFP
Technologies
PC8733 National
Semiconductor M5M44260ATP-7S Mitsubishi Keyboard Controller CL-PD6720 Cirrus Logic PCMCIA Controller 208-pin FQFP
Diskette Controller, IDE, Parallel Interface
100-pin FQFP
40-pin TSOP
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System Logic

The PT86C786/PT86C718 Pico Power chips and the Sequoia-1 PT86C768A2 chip each consist of a 176-pin thin-quad flat-package. This chip controller supports fast graphics and I/O processing. The system logic controller adds the following features:
built-in level 2 cache controller
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integrated active power management
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integrated battery management
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high performance DRAM controller.
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Flash ROM

The N28F020 flash ROM is a 32-pin, plastic lead chip carrier (PLCC). The chip allows easy updates to the system's BIOS if needed. More specifically, the ROM is flashed electronically, installing the latest BIOS revisions to the system. It is possible to reprogram the BIOS up to 100,000 times. See Section 2, Setup and Operation, for BIOS update procedures.
The N28F020 provides the system upgrade capability as well as the following:
2048-kilobit (kb) memory
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Quick-Pulse Programming Algorithm
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150 nanoseconds (ns) maximum access time
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ETOX Nonvolatile flash technology
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CMOS low power consumption
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low noise feature.
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ROM BIOS

The system uses a Flash ROM known as the system's ROM BIOS to store machine language programs. The BIOS size is 256 KB, which consists of 96 KB system utility (PCMCIA, Auto Setup), 64 KB system BIOS, 32 KB video BIOS, 32 KB power management and 32 KB reserved.
The BIOS programs execute the power-on self-test (POST), initialize CPU controllers, and interact with the LCD indicator panel, diskette drive, hard drive, communication devices and peripherals. The system BIOS also contains Auto Setup and provides VGA controller support. The ROM BIOS is copied into RAM (shadowing) for optimum performance.
The ROM BIOS contains both the system and video BIOS. The system BIOS is located in the upper portion of the device, video BIOS is located in the lower portion. System BIOS is located between F000h-FFFFh.
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The BIOS often changes after the product release to provide enhanced features or bug fixes. To acquire the latest BIOS release, the ROM is flashed electronically allowing the BIOS update to occur without removing the ROM. See Section 2, Setup and Operation, for BIOS upgrade procedures.

Peripheral Controller

The PT86C718 chip controls the Peripheral Controller, IDE Interface, and Interrupt Multiplexer. The chip integrates performance and power-saving features while providing the following:
8-level 64-bit write buffer to VL bus
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interrupt multiplexing logic
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reset logic.
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VGA Controller

The video architecture is maintained using the C&T65545B1-5 Controller and support logic. The controller supports video standards including EGA and CGA.
This powerful circuitry provides the following features for the system via the controller and LCD:
1-MB VRAM
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true-color and high-color display capability with 640 x 480 resolution
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supports external CRT resolutions up to 1024 x 768
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hardware windows acceleration
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bit boundary block transfer
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simultaneous LCD/CRT display in 640 x 480 VGA display mode
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optional frame memory
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high resolution graphics support.
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Video Controller Architecture

The video controller architecture is broken down into several modules. The five significant modules include the sequencer, CRT controller, graphics controller, attribute controller and dithering engine.
For example, the sequencer manages CPU and display memory timing. The CRT controller controls sync and timing signals. The graphics controller permits the flow of communication between the CPU data bus and the 32-bit internal data bus. The attribute controller produces a 4-bit wide video data stream that refreshes the display.
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