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# WESTERN DIGITAL CORPORATION
WD1003A-WA2
Chipset Western Digital
Data Bus 16-bit ISA
Card Size Full height, full length
Hard Drives Supported Two ST506/412(MFM) devices
Floppy Drives Supported Two 360KB or 1.2MB drives
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|----------------------+-------+---------------------+-------|
| 2-pin drive active | J1 | 34-pin control | J4 |
| LED | | cable connector - | |
| | | hard drive | |
|----------------------+-------+---------------------+-------|
| 20-pin data cable | J2 | 34-pin cable | J5 |
| connector - drive 2 | | connector - floppy | |
| | | drive | |
|----------------------+-------+---------------------+-------|
| 20-pin data cable | J3 | | |
| connector - drive 1 | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|-------------------------------------+-------+--------------|
| » | Factory configured - do not | W1 | Pins 1 & 2 |
| | alter | | closed |
|----+--------------------------------+-------+--------------|
| » | Factory configured - do not | W2/A | Open |
| | alter | | |
|----+--------------------------------+-------+--------------|
| » | Factory configured - do not | W2/B | Open |
| | alter | | |
|----+--------------------------------+-------+--------------|
| » | Factory configured - do not | W2/C | Open |
| | alter | | |
|----+--------------------------------+-------+--------------|
| » | RWC-NOT signal enabled | W5 | Pins 1 & 2 |
| | | | closed |
|----+--------------------------------+-------+--------------|
| | RWC-NOT signal disabled, | W5 | Pins 2 & 3 |
| | HS3-NOT signal enabled | | closed |
|----+--------------------------------+-------+--------------|
| » | Factory configured - do not | W6 | Unidentified |
| | alter | | |
|----+--------------------------------+-------+--------------|
| » | Factory configured - do not | W7 | Open |
| | alter | | |
|------------------------------------------------------------|
| Note:W6 may not be present on all versions of this |
| board. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HARD DRIVE 1 TYPE SELECTION |
|------------------------------------------------------------|
| Setting | W3 |
|----------------------------+-------------------------------|
| » | Standard | Pins 1 & 2 closed |
|---+------------------------+-------------------------------|
| | SyQuest | Pins 1 & 2 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HARD DRIVE 2 TYPE SELECTION |
|------------------------------------------------------------|
| Setting | W3 |
|----------------------------+-------------------------------|
| » | Standard | Pins 3 & 4 closed |
|---+------------------------+-------------------------------|
| | SyQuest | Pins 3 & 4 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HARD DRIVE ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | W4 |
|----------------------------+-------------------------------|
| » | Primary | Pins 3 & 5 closed |
|---+------------------------+-------------------------------|
| | Secondary | Pins 1 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | W4 |
|----------------------------+-------------------------------|
| » | Primary | Pins 4 & 6 closed |
|---+------------------------+-------------------------------|
| | Secondary | Pins 2 & 4 closed |
+------------------------------------------------------------+