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# WESTERN DIGITAL CORPORATION
WD1002A-WX1
Replaced by the WD1004A-WX1
+------------------------------------------------------------+
+------------------------------------------------------------+
Data bus: 8-bit, PC/XT
Size: Full-length, full-height card
Hard drives supported: Two MFM ST506/412 drives
Floppy drives supported: None
Maximum heads/cyl.: 16 heads and 1024 cylinders
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-------------------------------------------+----------------|
| 34-pin control cable connector-hard drive | J1 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 0 | J2 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 1 | J3 |
|-------------------------------------------+----------------|
| 5-pin connector-DC power | J4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|---------------------------------+-------------+------------|
| » | 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 | W6 | pins 1 & 2 |
| | supported (head select 3) | | closed |
|----+----------------------------+-------------+------------|
| » | x Hard Drive Interrupt is | W7 | pins 1 & 2 |
| | IRQ5 (hard-wired) | | closed |
|----+----------------------------+-------------+------------|
| | Hard Drive Interrupt is | W7 | pins 2 & 3 |
| | IRQ2 | | closed |
|----+----------------------------+-------------+------------|
| » | Single controller setting, | W8 | pins 2 & 3 |
| | primary controller | | closed |
|----+----------------------------+-------------+------------|
| | Dual controller setting, | W8 | pins 1 & 2 |
| | secondary controller | | closed |
|----+----------------------------+-------------+------------|
| » | Not used | S1/jumper 5 | open |
|----+----------------------------+-------------+------------|
| » | Not used | S1/jumper 6 | open |
|----+----------------------------+-------------+------------|
| » | *Hard Drive Interrupt is | S1/jumper 7 | open |
| | IRQ5 | | |
|----+----------------------------+-------------+------------|
| | *Hard Drive Interrupt is | S1/jumper 7 | closed |
| | IRQ2 | | |
|----+----------------------------+-------------+------------|
| | *XT mode enabled | S1/jumper 8 | open |
|----+----------------------------+-------------+------------|
| | *AT mode enabled | S1/jumper 8 | closed |
|------------------------------------------------------------|
| Note:* This controller can be purchased with several |
| different BIOS revisions. |
| |
| These jumpers are not applicable when used with some BIOS |
| revisions. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS REVISION "SUPER BIOS" DRIVE TYPE TABLE |
|------------------------------------------------------------|
| |Drive 0|Drive 1| | | | | | |
|---+-------+-------+------+------+-----+----+-----+---------|
| # | S1/1 | S1/2 | S1/3 | S1/4 |Cap. |Hds |Cyls.| WP |RWC |
|---+-------+-------+------+------+-----+----+-----+----+----|
| 0 |closed |closed |closed|closed|21MB | 4 | 612 |450 |450 |
|---+-------+-------+------+------+-----+----+-----+----+----|
| 1 | open |closed | open |closed|10MB | 4 | 306 | 0 |153 |
|---+-------+-------+------+------+-----+----+-----+----+----|
| 2 |closed | open |closed| open |10MB | 2 | 615 |450 |450 |
|---+-------+-------+------+------+-----+----+-----+----+----|
| 3 | open | open | open | open |21MB | 4 | 615 |450 |450 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS REVISION "G" DRIVE TYPE TABLE |
|------------------------------------------------------------|
|# |Drive 0|Drive 1| | | | | | |
|--+-------+-------+------+------+-----+-----+-----+---------|
|# | S1/1 | S1/2 | S1/3 | S1/4 |Cap. |Hds. |Cyl. | WP |RWC |
|--+-------+-------+------+------+-----+-----+-----+----+----|
|0 |closed |closed |closed|closed|20MB | 4 | 612 |none|none|
|--+-------+-------+------+------+-----+-----+-----+----+----|
|1 | open |closed | open |closed|10MB | 2 | 612 |128 |128 |
|--+-------+-------+------+------+-----+-----+-----+----+----|
|2 |closed | open |closed| open |20MB | 4 | 612 |128 |none|
|--+-------+-------+------+------+-----+-----+-----+----+----|
|3 | open | open | open | open |10MB | 4 | 306 | 0 |none|
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS REVISION "H" DRIVE TYPE TABLE - S1 |
| |
| JUMPERS 3, 4, & 8 CONFIGURE DRIVE 0 |
| |
| JUMPERS 1, 2 & 7 CONFIGURE DRIVE 1 |
|------------------------------------------------------------|
| # |S1/1 & 3|S1/2 & 4|S1/7 & 8| Cap. |Hds |Cyl. | WP | RWC |
|---+--------+--------+--------+------+----+-----+-----+-----|
| 0 | closed | closed | closed | 42MB | 5 | 977 |none |none |
|---+--------+--------+--------+------+----+-----+-----+-----|
| 1 | open | closed | closed | 31MB | 5 | 733 | 300 |none |
|---+--------+--------+--------+------+----+-----+-----+-----|
| 2 | closed | open | closed | 33MB | 6 | 640 |none |none |
|---+--------+--------+--------+------+----+-----+-----+-----|
| 3 | open | open | closed | 62MB | 8 |1024 |1024 |1024 |
|---+--------+--------+--------+------+----+-----+-----+-----|
| 4 | closed | closed | open | 42MB | 6 | 820 |none |none |
|---+--------+--------+--------+------+----+-----+-----+-----|
| 5 | open | closed | open | 10MB | 2 | 612 | 128 | 128 |
|---+--------+--------+--------+------+----+-----+-----+-----|
| 6 | closed | open | open | 20MB | 4 | 612 | 128 |none |
|---+--------+--------+--------+------+----+-----+-----+-----|
| 7 | open | open | open | 10MB | 4 | 306 | 0 |none |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| The Super BIOS revision includes the following features |
| not found in other revisions: ability to format bad |
| tracks, dual controller operation, automatic |
| configuration, virtual drive operation, and PC/AT |
| compatibility. 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 must not be changed. |
+------------------------------------------------------------+