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# WESTERN DIGITAL CORPORATION
WD286-WDM20
Processor 80286
Processor Speed 12.5MHz
Chip Set Faraday
Max. Onboard 4MB
DRAM
Cache None
BIOS AMI
Dimensions 330mm x 218mm
I/O Options Parallel port, serial ports (2), bus mouse
port, floppy drive interface, ST506/412
interface, video interface, IDE interface
NPU Options 80287
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface | J5 | Floppy drive | J16 |
| (optional) | | interface | |
|-------------------+----------+------------------+----------|
| Hard drive access | J10 | ST506/412 drive | J17 |
| LED | | control | |
|-------------------+----------+------------------+----------|
| Reset switch | J11 | Serial port 1 | J19 |
|-------------------+----------+------------------+----------|
| ST506/412 data | J12 | Serial port 2 | J20 |
| (Drive 0) | | | |
|-------------------+----------+------------------+----------|
| ST506/412 data | J13 | Video interface | J21 |
| (Drive 1) | | | |
|-------------------+----------+------------------+----------|
| Power LED & | J14 | PS/2 mouse port | J22 |
| keylock | | | |
|-------------------+----------+------------------+----------|
| Parallel port | J15 | Speaker | J24 |
| (LPT1) | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-------------------------------------+---------+------------|
| » | Factory configured - do not | W4 & W6 | Open |
| | alter | | |
|---+---------------------------------+---------+------------|
| » | Factory configured - do not | W7 | Closed |
| | alter | | |
|---+---------------------------------+---------+------------|
| » | Floppy drive interrupt enabled | W8 | Closed |
| | (IRQ6) | | |
|---+---------------------------------+---------+------------|
| | Floppy drive interrupt disabled | W8 | Open |
| | (IRQ6) | | |
|---+---------------------------------+---------+------------|
| » | Keyboard select AT compatible | W12 | Open |
| | (101 key) | | |
|---+---------------------------------+---------+------------|
| | Keyboard select XT compatible | W12 | Closed |
| | (83 key) | | |
|---+---------------------------------+---------+------------|
| » | Video port interrupt enabled | W13 | Closed |
| | (IRQ9) | | |
|---+---------------------------------+---------+------------|
| | Video port interrupt disabled | W13 | Open |
| | (IRQ9) | | |
|---+---------------------------------+---------+------------|
| » | Mouse port interrupt enabled | W17 | Closed |
| | (IRQ12) | | |
|---+---------------------------------+---------+------------|
| | Mouse port interrupt disabled | W17 | Open |
| | (IRQ12) | | |
|---+---------------------------------+---------+------------|
| » | Parallel port interrupt enabled | W19 | Closed |
| | (IRQ7) | | |
|---+---------------------------------+---------+------------|
| | Parallel port interrupt | W19 | Open |
| | disabled (IRQ7) | | |
|---+---------------------------------+---------+------------|
| » | Serial port 2 interrupt enabled | W20 | Closed |
| | (IRQ3) | | |
|---+---------------------------------+---------+------------|
| | Serial port 2 interrupt | W20 | Open |
| | disabled (IRQ3) | | |
|---+---------------------------------+---------+------------|
| » | Serial port 1 interrupt enabled | W21 | Closed |
| | (IRQ4) | | |
|---+---------------------------------+---------+------------|
| | Serial port 1 interrupt | W21 | Open |
| | disabled (IRQ4) | | |
|---+---------------------------------+---------+------------|
| » | Video port NMI enabled | W23 | Closed |
|---+---------------------------------+---------+------------|
| | Video port NMI disabled | W23 | Open |
|---+---------------------------------+---------+------------|
| » | Video port data buffering | W24 | pins 1 & 2 |
| | enabled | | closed |
|---+---------------------------------+---------+------------|
| | Video port data buffering | W24 | pins 2 & 3 |
| | disabled | | closed |
|---+---------------------------------+---------+------------|
| » | Video port enabled | W25 | Closed |
|---+---------------------------------+---------+------------|
| | Video port disabled | W25 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (2) 256K x 9 | (2) 256K x 9 |
|------------------+--------------------+--------------------|
| 2MB | (2) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 |
|------------------+--------------------+--------------------|
| 8MB | (2) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 10MB | (2) 1M x 9 | (2) 4M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO CONFIGURATION |
|------------------------------------------------------------|
| Type | S1/1 | S1/2 | S1/3 | S1/4 | S1/5 | W18 |
|-----------------+------+------+------+------+------+-------|
| Monochrome | Off | Off | On | Off | Off | 1 & 2 |
|-----------------+------+------+------+------+------+-------|
| CGA-40 columns | On | Off | Off | On | Off | 2 & 3 |
|-----------------+------+------+------+------+------+-------|
| CGA-80 columns | Off | Off | Off | On | Off | 2 & 3 |
|-----------------+------+------+------+------+------+-------|
| EGA-200 lines | On | On | On | Off | Off | 2 & 3 |
|-----------------+------+------+------+------+------+-------|
| EGA-350/480 | Off | On | On | Off | Off | 2 & 3 |
| lines | | | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HARD DRIVE CONFIGURATION |
|------------------------------------------------------------|
| Type | W3 | W5 | W10 | W22 |
|----------------+----------+----------+----------+----------|
| ST506/412 | Closed | Closed | Open | Open |
|----------------+----------+----------+----------+----------|
| IDE | Open | Open | Closed | Closed |
|----------------+----------+----------+----------+----------|
| Expansion card | Open | Open | Open | Open |
|------------------------------------------------------------|
| Note:An expansion card hard drive controller may be used |
| in addition to the ST506/412 with the ST506/412 |
| Settings. |
+------------------------------------------------------------+