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# 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
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|----------------------+----------+---------------+----------|
| Speaker | J109 | Floppy drive | J114 |
| | | power | |
|----------------------+----------+---------------+----------|
| External battery | J110 | Floppy drive | J115 |
| | | power | |
|----------------------+----------+---------------+----------|
| Proprietary keyboard | J111 | Main power | J116 |
| connector | | | |
|----------------------+----------+---------------+----------|
| Monitor power | J112 | Keylock | J117 |
|----------------------+----------+---------------+----------|
| Fixed drive power | J113 | Onboard power | LED1 |
| | | LED | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select Compaq | ED | pins 2 & 3 |
| | graphics/color | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | ED | pins 1 & 2 |
| | other than Compaq | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | EM | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | CPU speed select switchable at | ES | pins 1 & 2 |
| | keyboard | | 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! |
+------------------------------------------------------------+