DESKPRO 286 PORTABLE Motherboard Settings and Configuration
COMPAQ COMPUTER CORPORATION
DESKPRO 286 PORTABLE
Processor | 80286 |
Processor Speed | 8MHz |
Chip Set | ETEQ |
Max. Onboard DRAM | 640KB |
Cache | None |
BIOS | Compaq |
Dimensions | 330mm x 218mm |
I/O Options | None |
NPU Options | 80287 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Speaker | J109 | Floppy drive power | J114 |
External battery | J110 | Floppy drive power | J115 |
Proprietary keyboard connector | J111 | Main power | J116 |
Monitor power | J112 | Keylock | J117 |
Fixed drive power | J113 | Onboard power LED | LED1 |
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 |
DRAM CONFIGURATION | |||
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 |
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. | |||
BIOS (ROM SET 1) JUMPER CONFIGURATION | ||||
ROM type | Size | Speed | Jumper block E | |
| 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 |
| Dynamic | 8K x 8 | 150ns | pins 10 & 11, 13 & 14, and 17 & 18 closed |
| 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 |
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! | ||||
ROM SET 2 JUMPER CONFIGURATION | ||||
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 |
| 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 |
| 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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