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# WESTERN DIGITAL CORPORATION
WD1002A-WX1 (VER.1)
Data Bus 8-bit
Card Size Proprietary
Hard Drives supported Two ST-506/412(MFM) drives
Floppy drives supported None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location | Function | Location |
|-----------------------+----------+--------------+----------|
| 34-pin control cable | J1 | 5-pin | J4 |
| connector-hard drive | | connector-DC | |
| | | power | |
|-----------------------+----------+--------------+----------|
| 20-pin data cable | J2 | | |
| connector-drive 0 | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | BIOS enabled | W3 | Closed |
|---+-----------------------------------+-------+------------|
| | BIOS disabled | W3 | Open |
|---+-----------------------------------+-------+------------|
| » | I/O port address 320h | W4 | pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | I/O port address 324h | W4 | pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | BIOS ROM size 32K or 64K | W5 | pins 1 & 2 |
| | (hard-wired) | | closed |
|---+-----------------------------------+-------+------------|
| | BIOS ROM size 16K | W5 | pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | 8 head hard drive with RWC | W6 | pins 2 & 3 |
| | supported | | closed |
|---+-----------------------------------+-------+------------|
| | 16 head hard drive supported | W6 | pins 1 & 2 |
| | (head select 3) | | closed |
|---+-----------------------------------+-------+------------|
| » | Hard drive Interrupt is IRQ5 | W7 | pins 1 & 2 |
| | (hard-wired) | | closed |
|---+-----------------------------------+-------+------------|
| | Hard drive Interrupt is IRQ2 | W7 | pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Single controller setting, | W8 | pins 2 & 3 |
| | primary controller | | closed |
|---+-----------------------------------+-------+------------|
| | Dual controller setting, | W8 | pins 1 & 2 |
| | secondary controller | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - Do not alter | S1/5 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - Do not alter | S1/6 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - Do not alter | S1/7 | Open |
|---+-----------------------------------+-------+------------|
| » | Factory configured - Do not alter | S1/8 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS REVISION DRIVE TYPE TABLE |
|------------------------------------------------------------|
|Drive1 |Drive | | |
| | 0 | | |
|-------+------+------+--------------------------------------|
| | # | S1/1 | S1/2 | S1/3 | S1/4 |Cap. |Hds |Cyls.|WP |RWC|
|---+---+------+------+------+------+-----+----+-----+---+---|
| | 0 |Closed|Closed|Closed|Closed|20 MB| 4 | 612 |613|613|
|---+---+------+------+------+------+-----+----+-----+---+---|
| | 1 | Open |Closed| Open |Closed|10 MB| 2 | 612 |128|128|
|---+---+------+------+------+------+-----+----+-----+---+---|
| | 2 |Closed| Open |Closed| Open |20 MB| 4 | 612 |128|613|
|---+---+------+------+------+------+-----+----+-----+---+---|
|» | 3 | Open | Open | Open | Open |10 MB| 4 | 306 | 0 |306|
|------------------------------------------------------------|
|Note: S1/1 and S1/2 select the setting for drive1 & S1/3 and|
|S1/4 select the setting for drive 0 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| Note: This controller has a built-in low-level format |
| program. To enter the program, run the DEBUG utility |
| supplied with DOS and at the prompt enter: G=C800:5. |
| Two additional jumpers may be present, W1 & W2, and |
| are reserved for factory use and may not be changed. |
+------------------------------------------------------------+