(TXT) View Source
       
       # WESTERN DIGITAL CORPORATION
       
          WD1002S-WX2
       
          +------------------------------------------------------------+
          +------------------------------------------------------------+
       
          Data bus: 8-bit, PC/XT
       
          Size: Full-length, half-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   |
          |------------------------------------+----------+------------|
          |   | Reserved for BIOS              |  SW1/8   |    open    |
          |---+--------------------------------+----------+------------|
          |   | Reserved for BIOS              |  SW1/7   |    open    |
          |---+--------------------------------+----------+------------|
          |   | Reserved for BIOS Virtual      |  SW1/6   |    open    |
          |   | option                         |          |            |
          |---+--------------------------------+----------+------------|
          |   | Reserved for BIOS Auto-config  |  SW1/5   |    open    |
          |   | option                         |          |            |
          |---+--------------------------------+----------+------------|
          | » | Normal operation               |    W1    | pins 1 & 2 |
          |   |                                |          |   closed   |
          |---+--------------------------------+----------+------------|
          |   | Factory test                   |    W1    | pins 2 & 3 |
          |   |                                |          |   closed   |
          |---+--------------------------------+----------+------------|
          | » | Normal operation               |    W2    | pins 1 & 2 |
          |   |                                |          |   closed   |
          |---+--------------------------------+----------+------------|
          |   | Factory test                   |    W2    | pins 2 & 3 |
          |   |                                |          |   closed   |
          |---+--------------------------------+----------+------------|
          | » | 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 |
          |   | (hard-wired)                   |          |   closed   |
          |---+--------------------------------+----------+------------|
          |   | BIOS 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   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                BIOS DRIVE TYPE TABLE - SW1                 |
          |                                                            |
          |             JUMPERS 1 AND 2 CONFIGURE DRIVE 1              |
          |                                                            |
          |             JUMPERS 3 AND 4 CONFIGURE DRIVE 0              |
          |------------------------------------------------------------|
          | # | Jumper 1 | Jumper 2 | Cap. | Hds. | Cyls. |  WP  | RWC |
          |   |   & 3    |   & 4    |      |      |       |      |     |
          |---+----------+----------+------+------+-------+------+-----|
          | 0 |  closed  |  closed  | 21MB |  4   |  612  | 613  | 613 |
          |---+----------+----------+------+------+-------+------+-----|
          | 1 |   open   |  closed  | 10MB |  2   |  612  | 128  | 128 |
          |---+----------+----------+------+------+-------+------+-----|
          | 2 |  closed  |   open   | 21MB |  4   |  612  | 128  | 613 |
          |---+----------+----------+------+------+-------+------+-----|
          | 3 |   open   |   open   | 10MB |  4   |  306  | all  | 306 |
          |   |          |          |      |      |       | (0)  |     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               MISCELLANEOUS TECHNICAL NOTES                |
          |------------------------------------------------------------|
          |  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.           |
          +------------------------------------------------------------+