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DESKPRO 286 (VERSION 2)

COMPAQ COMPUTER CORPORATION

DESKPRO 286 (VERSION 2)

Processor

80286

Processor Speed

8MHz

Chip Set

ETEQ

Max. Onboard DRAM

2.125MB

Cache

None

BIOS

Compaq

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Fixed drive power

J109

Proprietary keyboard connector

J116

Fixed drive/Tape backup power

J110

Main power

J117

Floppy drive power

J111

External battery

J118

Floppy drive power

J112

Keylock

J119

Monitor power

J113

Onboard power LED

LED1

Speaker

J115

   

USER CONFIGURABLE SETTINGS

Function

Switch

Position

CPU speed select switchable at keyboard

SW1/6

Off

 

CPU speed select forced slow

SW1/6

On

Factory configured - do not alter

SW1/7

Off

Monitor type select color

SW1/8

On

 

Monitor type select monochrome

SW1/8

Off

DRAM CONFIGURATION

Size

Bank 0

P-0

Bank 1

Bank 2

Bank 3

Bank 4

256KB

(4) 4464

(2) 4164

(18) 4164

NONE

NONE

NONE

512KB

(4) 4464

(2) 4164

(18) 4164

(18) 4164

(18) 4164

NONE

640KB

(4) 4464

(2) 4164

(18) 4164

(18) 4164

(18) 4164

(18) 4164

640KB

(4) 4464

(2) 4164

(18) 41256

NONE

NONE

NONE

1.125MB

(4) 4464

(2) 4164

(18) 41256

(18) 41256

NONE

NONE

1.625MB

(4) 4464

(2) 4164

(18) 41256

(18) 41256

(18) 41256

NONE

2.125MB

(4) 4464

(2) 4164

(18) 41256

(18) 41256

(18) 41256

(18) 41256

DRAM JUMPER CONFIGURATION

Size

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

Disabled

N/A

On

On

N/A

N/A

256KB

On

On

Off

Off

Off

512KB

On

Off

On

Off

Off

640KB

On

Off

Off

Off

Off

640KB

Off

Off

Off

On

On

1.125MB

Off

Off

Off

On

Off

1.625MB

Off

Off

Off

Off

On

2.125MB

Off

Off

Off

Off

Off

Notes:Closing both SW1/switch 2 and SW1/switch 3, disables banks 0 & 1 and any onboard ROM.

Jumper configurations correlate directly to DRAM configurations.

ROM JUMPER CONFIGURATION

ROM type

Size

Speed

BIOS ROM/Jumper block E1

ROM set 2/Jumper block E2

Static

8K x 8

250ns

pins 1&2, 4&5, and 7&8 closed

pins 1&2, 4&5, and 7&8 closed

1Static

16K x 8

250ns

pins 2&3, 4&5, and 7&8 closed

pins 2&3, 4&5, and 7&8 closed

Static

32K x 8

250ns

pins 2&3, 5&6, and 7&8 closed

pins 2&3, 5&6, and 7&8 closed

Dynamic

8K x 8

150ns

pins 1&2, 4&5, and 8&9 closed

pins 1&2, 4&5, and 8&9 closed

Dynamic

16K x 8

150ns

pins 2&3, 4&5, and 8&9 closed

pins 2&3, 4&5, and 8&9 closed

2Dynamic

32K x 8

150ns

pins 2&3, 5&6, and 8&9 closed

pins 2&3, 5&6, and 8&9 closed

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

the indicated locations.

1) Default for BIOS ROM

2) Default for ROM set 2

WARNING : Modifying the factory configurations will void the manufacturer's warranty!