COMPAQ COMPUTER CORPORATION
DESKPRO 286 PORTABLE
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Processor |
80286 |
|
Processor Speed |
8MHz |
|
Chip Set |
ETEQ |
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Max. Onboard DRAM |
640KB |
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Cache |
None |
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BIOS |
Compaq |
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Dimensions |
330mm x 218mm |
|
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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Speaker |
J109 |
Floppy drive power |
J114 |
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External battery |
J110 |
Floppy drive power |
J115 |
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Proprietary keyboard connector |
J111 |
Main power |
J116 |
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Monitor power |
J112 |
Keylock |
J117 |
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Fixed drive power |
J113 |
Onboard power LED |
LED1 |
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USER CONFIGURABLE SETTINGS |
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Function |
Jumper |
Position |
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|
» |
Monitor type select Compaq graphics/color |
ED |
pins 2 & 3 closed |
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|
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 |
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|
CPU speed select forced slow |
ES |
pins 2 & 3 closed |
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DRAM CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
Jumper MS |
|
256KB |
(18) 4164 |
(18) 4164 |
pins 1 & 2 closed |
|
512KB |
NONE |
(18) 41256 |
pins 1 & 2 closed |
|
640KB |
(18) 4164 |
(18) 41256 |
pins 2 & 3 closed |
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Note: Boards that come from the manufacturer with 640KB installed have a different memory PAL chip installed than those that come with 256KB. This chip allows the user to disable bank 0 and use only bank 1, thus enabling the system to use older software that will not work on systems with more than 512KB. |
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BIOS (ROM SET 1) JUMPER CONFIGURATION |
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ROM type |
Size |
Speed |
Jumper block E |
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|
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Static |
8K x 8 |
250ns |
pins 10 & 11, 13 & 14, and 16 & 17 closed |
|
» |
Static |
16K x 8 |
250ns |
pins 10 & 11, 14 & 15, and 16 & 17 closed |
|
|
Static |
32K x 8 |
250ns |
pins 11 & 12, 14 & 15, and 16 & 17 closed |
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Dynamic |
8K x 8 |
150ns |
pins 10 & 11, 13 & 14, and 17 & 18 closed |
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Dynamic |
16K x 8 |
150ns |
pins 10 & 11, 14 & 15, and 17 & 18 closed |
|
|
Dynamic |
32K x 8 |
150ns |
pins 11 & 12, 14 & 15, and 17 & 18 closed |
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Note: Settings are accomplished by cutting the conductors on the bottom of the board and re-soldering the indicated locations WARNING : Modifying the factory configurations will void the manufacturers warranty! |
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ROM SET 2 JUMPER CONFIGURATION |
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ROM type |
Size |
Speed |
Jumper block E |
|
|
|
Static |
8K x 8 |
250ns |
pins 4 & 5, 7 & 8, and 19 & 20 closed |
|
|
Static |
16K x 8 |
250ns |
pins 4 & 5, 8 & 9, and 19 & 20 closed |
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|
Static |
32K x 8 |
250ns |
pins 5 & 6, 8 & 9, and 19 & 20 closed |
|
|
Dynamic |
8K x 8 |
150ns |
pins 4 & 5, 7 & 8, and 20 & 21 closed |
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|
Dynamic |
16K x 8 |
150ns |
pins 4 & 5, 8 & 9, and 20 & 21 closed |
|
» |
Dynamic |
32K x 8 |
150ns |
pins 5 & 6, 8 & 9, and 20 & 21 closed |
|
Note: Settings are accomplished by cutting the conductors on the bottom of the board and re-soldering the connections at the indicated locations WARNING : Modifying the factory configurations will void the manufacturers warranty! |
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