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# COMPAQ COMPUTER CORPORATION
DESKPRO 286 (VERSION 1)
Processor 80286
Processor Speed 8MHz
Chip Set ETEQ
Max. Onboard DRAM 2.125MB (on system memory card)
Cache None
BIOS Compaq
Dimensions 330mm x 218mm
I/O Options Proprietary system memory card
NPU Options 80287
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Keyboard power | F1 | Speaker | J115 |
| fuse | | | |
|------------------+----------+-------------------+----------|
| Monitor power | F2 | Proprietary | J116 |
| fuse | | keyboard plug | |
|------------------+----------+-------------------+----------|
| Fixed drive | J109 | Main power | J117 |
| power | | | |
|------------------+----------+-------------------+----------|
| Fixed drive/tape | J110 | External battery | J118 |
| backup power | | | |
|------------------+----------+-------------------+----------|
| Floppy drive | J111 | Keylock | J119 |
| power | | | |
|------------------+----------+-------------------+----------|
| Floppy drive | J112 | Onboard power LED | LED1 |
| power | | | |
|------------------+----------+-------------------+----------|
| Monitor power | J113 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
SYSTEM MEMORY CARD (VERSION 1)
(IMG) IMG 2
+------------------------------------------------------------+
| ROM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| ROM type | Size | Speed | BIOS ROM / | ROM set 2 / |
| | | | Jumper block E | Jumper block E |
|----------+------+-------+-----------------+----------------|
| Static | 8K x | 250ns | pins 7&8, | pins 1&2, 4&5, |
| | 8 | | 10&11, 13&14 | 22&23 closed |
| | | | closed | |
|----------+------+-------+-----------------+----------------|
| 1 Static | 16K | 250ns | pins 8&9, | pins 2&3, 4&5, |
| | x 8 | | 10&11, 13&14 | 22&23 closed |
| | | | closed | |
|----------+------+-------+-----------------+----------------|
| Static | 32K | 250ns | pins 8&9, | pins 2&3, 5&6, |
| | x 8 | | 11&12, 13&14 | 22&23 closed |
| | | | closed | |
|----------+------+-------+-----------------+----------------|
| Dynamic | 8K x | 150ns | pins 7&8, | pins 1&2, 4&5, |
| | 8 | | 10&11, 14&15 | 20&21 closed |
| | | | closed | |
|----------+------+-------+-----------------+----------------|
| Dynamic | 16K | 150ns | pins 8&9, | pins 2&3, 4&5, |
| | x 8 | | 10&11, 14&15 | 20&21 closed |
| | | | closed | |
|----------+------+-------+-----------------+----------------|
| 2Dynamic | 32K | 150ns | pins 8&9, | pins 2&3, 5&6, |
| | x 8 | | 11&12, 14&15 | 20&21 closed |
| | | | closed | |
|------------------------------------------------------------|
| Note: 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 manufacturers warranty! |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | Bank 4 |
|----------+----------+---------+---------+---------+--------|
| 256KB | (2) 64K | (18) | NONE | NONE | NONE |
| | x 9 | 4164 | | | |
|----------+----------+---------+---------+---------+--------|
| 512KB | (2) 64K | (18) | (18) | (18) | NONE |
| | x 9 | 4164 | 4164 | 4164 | |
|----------+----------+---------+---------+---------+--------|
| 640KB | (2) 64K | (18) | (18) | (18) | (18) |
| | x 9 | 4164 | 4164 | 4164 | 4164 |
|----------+----------+---------+---------+---------+--------|
| 640KB | (2) 64K | (18) | NONE | NONE | NONE |
| | x 9 | 41256 | | | |
|----------+----------+---------+---------+---------+--------|
| 1.125MB | (2) 64K | (18) | (18) | NONE | NONE |
| | x 9 | 41256 | 41256 | | |
|----------+----------+---------+---------+---------+--------|
| 1.625MB | (2) 64K | (18) | (18) | (18) | NONE |
| | x 9 | 41256 | 41256 | 41256 | |
|----------+----------+---------+---------+---------+--------|
| 2.125MB | (2) 64K | (18) | (18) | (18) | (18) |
| | x 9 | 41256 | 41256 | 41256 | 41256 |
|------------------------------------------------------------|
| Note: Bank 0is permanently affixed to the memory board and |
| is not alterable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | E1 | E2 |
|------------------+--------------------+--------------------|
| 256KB | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 512KB | pins 1 & 2 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 640KB | pins 1 & 2 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 640KB | pins 2 & 3 closed | pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 1.125MB | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 1.625MB | pins 2 & 3 closed | pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| 2.125MB | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
SYSTEM MEMORY CARD (VERSIONS 2 & 3)
(IMG) IMG 3
Note: Versions 2 & 3 are differentiated by
Their assembly numbers
Version 2 has assembly #'s 000178-XXX
Version 3 has assembly #'s 000382-XXX
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank | P-0 | Bank 1 | Bank 2 | Bank 3 | Bank |
| | 0 | | | | | 4 |
|---------+------+------+----------+--------+--------+-------|
| 256KB | (4) | (2) | (18) | NONE | NONE | NONE |
| | 4464 | 4164 | 4164 | | | |
|---------+------+------+----------+--------+--------+-------|
| 512KB | (4) | (2) | (18) | (18) | (18) | NONE |
| | 4464 | 4164 | 4164 | 4164 | 4164 | |
|---------+------+------+----------+--------+--------+-------|
| 640KB | (4) | (2) | (18) | (18) | (18) | (18) |
| | 4464 | 4164 | 4164 | 4164 | 4164 | 4164 |
|---------+------+------+----------+--------+--------+-------|
| * 640KB | (4) | (2) | (18) | NONE | NONE | NONE |
| | 4464 | 4164 | 41256 | | | |
|---------+------+------+----------+--------+--------+-------|
| 1.125MB | (4) | (2) | (18) | (18) | NONE | NONE |
| | 4464 | 4164 | 41256 | 41256 | | |
|---------+------+------+----------+--------+--------+-------|
| 1.625MB | (4) | (2) | (18) | (18) | (18) | NONE |
| | 4464 | 4164 | 41256 | 41256 | 41256 | |
|---------+------+------+----------+--------+--------+-------|
| 2.125MB | (4) | (2) | (18) | (18) | (18) | (18) |
| | 4464 | 4164 | 41256 | 41256 | 41256 | 41256 |
|------------------------------------------------------------|
| Notes: Version 3 of the system memory board does not |
| support the second 640KB configuration using (18) 41256 |
| chips in bank 1. |
| |
| Bank 0 is permanently affixed to the memory board and is |
| not alterable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | Version 2 E1 | Version 3 E1 |
|---------+---------------------------+----------------------|
| 256KB | pins 1 & 2 and 4 & 5 | pins 2 & 3 and 4 & 5 |
| | closed | closed |
|---------+---------------------------+----------------------|
| 512KB | pins 1 & 2 and 4 & 5 | pins 1 & 2 and 4 & 5 |
| | closed | closed |
|---------+---------------------------+----------------------|
| 640KB | pins 1 & 2 and 5 & 6 | pins 1 & 2 and 5 & 6 |
| | closed | closed |
|---------+---------------------------+----------------------|
| 640KB | pins 2 & 3 and 4 & 5 | N/A |
| | closed | |
|---------+---------------------------+----------------------|
| 1.125MB | pins 2 & 3 and 5 & 6 | pins 2 & 3 and 5 & 6 |
| | closed | closed |
|---------+---------------------------+----------------------|
| 1.625MB | pins 2 & 3 and 5 & 6 | pins 2 & 3 and 5 & 6 |
| | closed | closed |
|---------+---------------------------+----------------------|
| 2.125MB | pins 2 & 3 and 5 & 6 | pins 2 & 3 and 5 & 6 |
| | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ROM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| ROM type | Size | Speed | BIOS ROM/Jumper | ROM set |
| | | | Block E2 | 2/Jumper |
| | | | | Block E3 |
|-----------+--------+--------+------------------+-----------|
| Static | 8K x 8 | 250ns | pins 1&2, 4&5, | pins 1&2, |
| | | | 7&8 closed | 4&5, 7&8 |
| | | | | closed |
|-----------+--------+--------+------------------+-----------|
| 1Static | 16K x | 250ns | pins 2&3, 4&5, | pins 2&3, |
| | 8 | | 7&8 closed | 4&5, 7&8 |
| | | | | closed |
|-----------+--------+--------+------------------+-----------|
| Static | 32K x | 250ns | pins 2&3, 5&6, | pins 2&3, |
| | 8 | | 7&8 closed | 5&6, 7&8 |
| | | | | closed |
|-----------+--------+--------+------------------+-----------|
| Dynamic | 8K x 8 | 150ns | pins 1&2, 4&5, | pins 1&2, |
| | | | 8&9 closed | 4&5, 8&9 |
| | | | | closed |
|-----------+--------+--------+------------------+-----------|
| Dynamic | 16K x | 150ns | pins 2&3, 4&5, | pins 2&3, |
| | 8 | | 8&9 closed | 4&5, 8&9 |
| | | | | closed |
|-----------+--------+--------+------------------+-----------|
| 2Dynamic | 32K x | 150ns | pins 2&3, 5&6, | pins 2&3, |
| | 8 | | 8&9 closed | 5&6, 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 manufacturers warranty! |
+------------------------------------------------------------+