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DESKPRO 286 (VERSION 1)

COMPAQ COMPUTER CORPORATION

DESKPRO 286 (VERSION 1)

Processor

80286

Processor Speed

8MHz

Chip Set

ETEQ

Max. Onboard DRAM

2.125MB (on system memory card)

Cache

None

BIOS

Compaq

Dimensions

330mm x 218mm

I/O Options

Proprietary system memory card

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Keyboard power fuse

F1

Speaker

J115

Monitor power fuse

F2

Proprietary keyboard plug

J116

Fixed drive power

J109

Main power

J117

Fixed drive/tape backup power

J110

External battery

J118

Floppy drive power

J111

Keylock

J119

Floppy drive power

J112

Onboard power LED

LED1

Monitor power

J113

 

 

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

SYSTEM MEMORY CARD (VERSION 1)

ROM JUMPER CONFIGURATION

ROM type

Size

Speed

BIOS ROM / Jumper block E

ROM set 2 / Jumper block E

Static

8K x 8

250ns

pins 7&8, 10&11, 13&14 closed

pins 1&2, 4&5, 22&23 closed

1 Static

16K x 8

250ns

pins 8&9, 10&11, 13&14 closed

pins 2&3, 4&5, 22&23 closed

Static

32K x 8

250ns

pins 8&9, 11&12, 13&14 closed

pins 2&3, 5&6, 22&23 closed

Dynamic

8K x 8

150ns

pins 7&8, 10&11, 14&15 closed

pins 1&2, 4&5, 20&21 closed

Dynamic

16K x 8

150ns

pins 8&9, 10&11, 14&15 closed

pins 2&3, 4&5, 20&21 closed

2Dynamic

32K x 8

150ns

pins 8&9, 11&12, 14&15 closed

pins 2&3, 5&6, 20&21 closed

Note: 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 manufacturers warranty!

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

Bank 4

256KB

(2) 64K x 9

(18) 4164

NONE

NONE

NONE

512KB

(2) 64K x 9

(18) 4164

(18) 4164

(18) 4164

NONE

640KB

(2) 64K x 9

(18) 4164

(18) 4164

(18) 4164

(18) 4164

640KB

(2) 64K x 9

(18) 41256

NONE

NONE

NONE

1.125MB

(2) 64K x 9

(18) 41256

(18) 41256

NONE

NONE

1.625MB

(2) 64K x 9

(18) 41256

(18) 41256

(18) 41256

NONE

2.125MB

(2) 64K x 9

(18) 41256

(18) 41256

(18) 41256

(18) 41256

Note: Bank 0is permanently affixed to the memory board and is not alterable.

DRAM JUMPER CONFIGURATION

Size

E1

E2

256KB

pins 1 & 2 closed

pins 2 & 3 closed

512KB

pins 1 & 2 closed

pins 1 & 2 closed

640KB

pins 1 & 2 closed

pins 2 & 3 closed

640KB

pins 2 & 3 closed

pins 1 & 2 closed

1.125MB

pins 2 & 3 closed

pins 2 & 3 closed

1.625MB

pins 2 & 3 closed

pins 2 & 3 closed

2.125MB

pins 2 & 3 closed

pins 2 & 3 closed

SYSTEM MEMORY CARD (VERSIONS 2 & 3)

Note: Versions 2 & 3 are differentiated by

Their assembly numbers

Version 2 has assembly #'s 000178-XXX

Version 3 has assembly #'s 000382-XXX

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

Notes: Version 3 of the system memory board does not support the second 640KB configuration using (18) 41256 chips in bank 1.

Bank 0 is permanently affixed to the memory board and is not alterable.

DRAM JUMPER CONFIGURATION

Size

Version 2 E1

Version 3 E1

256KB

pins 1 & 2 and 4 & 5 closed

pins 2 & 3 and 4 & 5 closed

512KB

pins 1 & 2 and 4 & 5 closed

pins 1 & 2 and 4 & 5 closed

640KB

pins 1 & 2 and 5 & 6 closed

pins 1 & 2 and 5 & 6 closed

640KB

pins 2 & 3 and 4 & 5 closed

N/A

1.125MB

pins 2 & 3 and 5 & 6 closed

pins 2 & 3 and 5 & 6 closed

1.625MB

pins 2 & 3 and 5 & 6 closed

pins 2 & 3 and 5 & 6 closed

2.125MB

pins 2 & 3 and 5 & 6 closed

pins 2 & 3 and 5 & 6 closed

ROM JUMPER CONFIGURATION

ROM type

Size

Speed

BIOS ROM/Jumper Block E2

ROM set 2/Jumper Block E3

Static

8K x 8

250ns

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

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

1Static

16K x 8

250ns

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

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

Static

32K x 8

250ns

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

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

Dynamic

8K x 8

150ns

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

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

Dynamic

16K x 8

150ns

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

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

2Dynamic

32K x 8

150ns

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

pins 2&3, 5&6, 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 manufacturers warranty!