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DESKPRO 286 PORTABLE

COMPAQ COMPUTER CORPORATION

DESKPRO 286 PORTABLE

Processor

80286

Processor Speed

8MHz

Chip Set

ETEQ

Max. Onboard DRAM

640KB

Cache

None

BIOS

Compaq

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

J109

Floppy drive power

J114

External battery

J110

Floppy drive power

J115

Proprietary keyboard connector

J111

Main power

J116

Monitor power

J112

Keylock

J117

Fixed drive power

J113

Onboard power LED

LED1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select Compaq graphics/color

ED

pins 2 & 3 closed

 

Monitor type select monochrome other than Compaq

ED

pins 1 & 2 closed

Factory configured - do not alter

EM

pins 1 & 2 closed

CPU speed select switchable at keyboard

ES

pins 1 & 2 closed

 

CPU speed select forced slow

ES

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Jumper MS

256KB

(18) 4164

(18) 4164

pins 1 & 2 closed

512KB

NONE

(18) 41256

pins 1 & 2 closed

640KB

(18) 4164

(18) 41256

pins 2 & 3 closed

Note: Boards that come from the manufacturer with 640KB installed have a different memory PAL chip installed than those that come with 256KB. This chip allows the user to disable bank 0 and use only bank 1, thus enabling the system to use older software that will not work on systems with more than 512KB.

BIOS (ROM SET 1) JUMPER CONFIGURATION

ROM type

Size

Speed

Jumper block E

 

Static

8K x 8

250ns

pins 10 & 11, 13 & 14, and 16 & 17 closed

Static

16K x 8

250ns

pins 10 & 11, 14 & 15, and 16 & 17 closed

 

Static

32K x 8

250ns

pins 11 & 12, 14 & 15, and 16 & 17 closed

 

Dynamic

8K x 8

150ns

pins 10 & 11, 13 & 14, and 17 & 18 closed

 

Dynamic

16K x 8

150ns

pins 10 & 11, 14 & 15, and 17 & 18 closed

 

Dynamic

32K x 8

150ns

pins 11 & 12, 14 & 15, and 17 & 18 closed

Note: Settings are accomplished by cutting the conductors on the bottom of the board and re-soldering the indicated locations

WARNING : Modifying the factory configurations will void the manufacturers warranty!

ROM SET 2 JUMPER CONFIGURATION

ROM type

Size

Speed

Jumper block E

 

Static

8K x 8

250ns

pins 4 & 5, 7 & 8, and 19 & 20 closed

 

Static

16K x 8

250ns

pins 4 & 5, 8 & 9, and 19 & 20 closed

 

Static

32K x 8

250ns

pins 5 & 6, 8 & 9, and 19 & 20 closed

 

Dynamic

8K x 8

150ns

pins 4 & 5, 7 & 8, and 20 & 21 closed

 

Dynamic

16K x 8

150ns

pins 4 & 5, 8 & 9, and 20 & 21 closed

Dynamic

32K x 8

150ns

pins 5 & 6, 8 & 9, and 20 & 21 closed

Note: Settings are accomplished by cutting the conductors on the bottom of the board and re-soldering the connections at the indicated locations

WARNING : Modifying the factory configurations will void the manufacturers warranty!