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# WESTERN DIGITAL CORPORATION
WD1002S-WX2A
+------------------------------------------------------------+
+------------------------------------------------------------+
Data bus: 8-bit, PC/XT
Size: Full-length, full-height card
Hard drives supported: Two MFM ST506/412 drives
Floppy drives supported: None
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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|--------------------------------+--------------+------------|
| » | Not used | W1 & W2 | N/A |
|---+----------------------------+--------------+------------|
| » | 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 size 32K or 64K | W5 | pins 1 & 2 |
| | | | closed |
|---+----------------------------+--------------+------------|
| | BIOS size 16K | W5 | pins 2 & 3 |
| | | | closed |
|---+----------------------------+--------------+------------|
| » | 16 head hard drive | W6 | pins 1 & 2 |
| | supported (Head Select 3) | | closed |
|---+----------------------------+--------------+------------|
| | 8 Head hard drive with RWC | W6 | pins 2 & 3 |
| | supported | | closed |
|---+----------------------------+--------------+------------|
| » | Hard Drive Interrupt is | W7 | pins 1 & 2 |
| | IRQ5 | | closed |
|---+----------------------------+--------------+------------|
| | Hard Drive Interrupt is | W7 | pins 2 & 3 |
| | IRQ2 | | closed |
|---+----------------------------+--------------+------------|
| » | Factory setting | W8 | pins 2 & 3 |
| | | | closed |
|---+----------------------------+--------------+------------|
| | CO23 setting | W9 | pins 1 & 2 |
| | | | closed |
|---+----------------------------+--------------+------------|
| » | Standard Configuration | W10 | pins 2 & 3 |
| | | | closed |
|---+----------------------------+--------------+------------|
| | Special feature | W10 | pins 1 & 2 |
| | | | closed |
|---+----------------------------+--------------+------------|
| » | Factory configured - do | SW1/jumper 5 | open |
| | not alter | | |
|---+----------------------------+--------------+------------|
| » | Factory configured - do | SW1/jumper 6 | open |
| | not alter | | |
|---+----------------------------+--------------+------------|
| » | Hard Drive Interrupt is | SW1/jumper 7 | open |
| | IRQ5 | | |
|---+----------------------------+--------------+------------|
| | Hard Drive Interrupt is | SW1/jumper 7 | closed |
| | IRQ2 (JP7/pins 2-3 must be | | |
| | closed and a custom BIOS | | |
| | must be install) | | |
|---+----------------------------+--------------+------------|
| » | AT mode enabled | SW1/jumper 8 | closed |
|---+----------------------------+--------------+------------|
| | XT mode enabled | SW1/jumper 8 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS REVISION "SUPER BIOS" DRIVE TYPE TABLE |
|------------------------------------------------------------|
| |Drive 1|Drive 0| | | | | | |
|---+-------+-------+------+------+-----+----+-----+---------|
| # | SW1/1 | SW1/2 |SW1/3 |SW1/4 |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 1|Drive 0| | | | | | |
|--+-------+-------+------+------+-----+-----+-----+---------|
|# | SW1/1 | SW1/2 |SW1/3 |SW1/4 |Cap. |Hds. |Cyl. | WP |RWC |
|--+-------+-------+------+------+-----+-----+-----+----+----|
|0 |closed |closed |closed|closed|20MB | 4 | 612 | 0 |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 |
| |
| JUMPERS 3, 4, & 8 CONFIGURE DRIVE 0 |
| |
| JUMPERS 1, 2 & 7 CONFIGURE DRIVE 1 |
|------------------------------------------------------------|
|# |SW1/1 & 3|SW1/2 & 4|SW1/7 & 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 |
|------------------------------------------------------------|
| This controller can be purchased with several different |
| BIOS revisions. 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. |
+------------------------------------------------------------+