COMPAQ COMPUTER CORPORATION
DESKPRO 286 (12MHz)
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Processor |
80286 |
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Processor Speed |
12MHz |
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Chip Set |
ETEQ |
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Max. Onboard DRAM |
2.125MB |
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Cache |
None |
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BIOS |
Compaq |
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Dimensions |
330mm x 218mm |
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I/O Options |
None |
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NPU Options |
80287 |
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CONNECTIONS |
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Purpose |
Location |
Purpose |
Location |
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Fixed drive power |
J109 |
Proprietary keyboard connector |
J116 |
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Fixed drive/Tape backup power |
J110 |
Main power |
J117 |
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Floppy drive power |
J111 |
External battery |
J118 |
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Floppy drive power |
J112 |
Keylock |
J119 |
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Monitor power |
J113 |
Onboard power LED |
LED1 |
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Speaker |
J115 |
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USER CONFIGURABLE SETTINGS |
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Function |
Jumper/Switch |
Position |
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Oscillator type select single package |
E3 |
Closed |
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Oscillator type select dual package |
E3 |
Open |
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Memory operation generation select discrete gate |
E4 |
pins 1 & 2 closed |
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Memory operation generation select CBC internal |
E4 |
pins 2 & 3 closed |
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Auto slowdown disabled in software |
E5 |
pins 1 & 2 closed |
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Auto slowdown enabled in software |
E5 |
pins 2 & 3 closed |
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CPU speed select switchable at keyboard |
SW1/6 |
Off |
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CPU speed select forced slow |
SW1/6 |
On |
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Factory configured - do not alter |
SW1/7 |
Off |
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Monitor type select color |
SW1/8 |
On |
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Monitor type select monochrome |
SW1/8 |
Off |
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Notes: Settings for E3, E4, and E5 are accomplished by cutting the conductors on the bottom of the board and re-soldering the indicated locations. WARNING: Modifying E3, E4, or E5 will void the manufacturers warranty! |
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DRAM CONFIGURATION |
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Size |
Bank 0 |
P-0 |
Bank 1 |
Bank 2 |
Bank 3 |
Bank 4 |
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256KB |
(4) 4464 |
(2) 4164 |
(18) 4164 |
NONE |
NONE |
NONE |
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512KB |
(4) 4464 |
(2) 4164 |
(18) 4164 |
(18) 4164 |
(18) 4164 |
NONE |
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640KB |
(4) 4464 |
(2) 4164 |
(18) 4164 |
(18) 4164 |
(18) 4164 |
(18) 4164 |
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640KB |
(4) 4464 |
(2) 4164 |
(18) 41256 |
NONE |
NONE |
NONE |
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1.125MB |
(4) 4464 |
(2) 4164 |
(18) 41256 |
(18) 41256 |
NONE |
NONE |
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1.625MB |
(4) 4464 |
(2) 4164 |
(18) 41256 |
(18) 41256 |
(18) 41256 |
NONE |
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2.125MB |
(4) 4464 |
(2) 4164 |
(18) 41256 |
(18) 41256 |
(18) 41256 |
(18) 41256 |
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DRAM SWITCH CONFIGURATION |
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Size |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
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Disabled |
N/A |
On |
On |
N/A |
N/A |
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256KB |
On |
On |
Off |
Off |
Off |
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512KB |
On |
Off |
On |
Off |
Off |
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640KB |
On |
Off |
Off |
Off |
Off |
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640KB |
Off |
Off |
Off |
On |
On |
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1.125MB |
Off |
Off |
Off |
On |
Off |
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1.625MB |
Off |
Off |
Off |
Off |
On |
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2.125MB |
Off |
Off |
Off |
Off |
Off |
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Notes: Closing both SW1/switch 2 and SW1/switch 3, disables banks 0 & 1 and any onboard ROM. |
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ROM JUMPER CONFIGURATION |
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ROM type |
Size |
BIOS ROM/E1 |
ROM set 2/E2 |
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Static |
8K x 8 |
1 & 2, 4 & 5, 7 & 8 |
1 & 2, 4 & 5, 7 & 8 |
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Static |
16K x 8 |
2 & 3, 4 & 5, 7 & 8 |
2 & 3, 4 & 5, 7 & 8 |
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Static |
32K x 8 |
2 & 3, 4 & 5, 7 & 8 |
2 & 3, 5 & 6, 7 & 8 |
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Dynamic |
8K x 8 |
1 & 2, 4 & 5, 8 & 9 |
1 & 2, 4 & 5, 8 & 9 |
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Dynamic |
16K x 8 |
2 & 3, 4 & 5, 8 & 9 |
2 & 3, 4 & 5, 8 & 9 |
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Dynamic |
32K x 8 |
2 & 3, 5 & 6, 8 & 9 |
2 & 3, 5 & 6, 8 & 9 |
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Notes: Settings are accomplished by cutting the conductors on the bottom of the board and re-soldering the indicated locations. Pins designated should be in the closed position. WARNING: Modifying the factory configurations will void the manufacturers warranty! |
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