DESKPRO 286 (VERSION 1) Motherboard Settings and Configuration

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.

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.

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!