DESKPRO 286 (VERSION 2) Motherboard Settings and Configuration

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!

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DESKPRO 286 (VERSION 2) Motherboard Settings and Configuration

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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!