(TXT) View Source
       
       # WESTERN DIGITAL CORPORATION
       
          WDXT-GEN2, WDXT-GEN2 PLUS, WDXT-GEN2R
       
          Data bus: 8-bit, PC/XT
       
          Size: Half-length, full-height card
       
          Hard drives supported: Two MFM ST506/412 drives
          (WDXT-GEN2/GEN2 PLUS)
       
          Two RLL ST506/412 drives (WDXT-GEN2R)
       
          Floppy drives supported: None
       
          Maximum heads/cyl.: Maximum 8 heads and 1024 cylinders
          (WDXT-GEN2/GEN2 PLUS)
       
          Maximum 15 heads and 1024 cylinders (WDXT-GEN2R)
       
 (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 (optional)       |       J4       |
          |-------------------------------------------+----------------|
          | 4-pin connector-drive active LED          |       J5       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |      SECTORS AND CONFIGURATION OPTIONS FOR RLL TABLE       |
          |                        (WDXT-GEN2R)                        |
          |------------------------------------------------------------|
          |  Sectors   | Translation  |  Dynamic  |   R25    |   R26   |
          |------------+--------------+-----------+----------+---------|
          | »   |  17  |     yes      |    no     |  closed  |  open   |
          |-----+------+--------------+-----------+----------+---------|
          | »   |  26  |      no      |    yes    |   open   | closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function                | Location | Setting |
          |---------------------------------------+----------+---------|
          | » | Internal BIOS selected            |   R23    |  open   |
          |---+-----------------------------------+----------+---------|
          | » | External BIOS selected            |   R23    | closed  |
          |---+-----------------------------------+----------+---------|
          | » | Factory configured - do not alter |   R25    |  open   |
          |   | (WDXT-GEN2/GEN2 PLUS)             |          |         |
          |---+-----------------------------------+----------+---------|
          | » | Factory configured - do not alter |   R26    |  open   |
          |   | (WDXT-GEN2/GEN2 PLUS)             |          |         |
          |---+-----------------------------------+----------+---------|
          | » | IRQ5 select                       |   R27    |  open   |
          |---+-----------------------------------+----------+---------|
          | » | IRQ2 select                       |   R27    | closed  |
          |---+-----------------------------------+----------+---------|
          | » | XT mode enabled                   |   R28    |  open   |
          |---+-----------------------------------+----------+---------|
          | » | XT mode disabled                  |   R28    | closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |       DRIVE TYPE CONFIGURATION (WDXT-GEN2/GEN2 PLUS)       |
          |------------------------------------------------------------|
          |         |Drive 0|Drive 1|      |      |        |           |
          |---------+-------+-------+------+------+--------+-----------|
          | |Table #|  R17  |  R18  | R19  | R20  |Capacity|Heads|Cyls.|
          |-+-------+-------+-------+------+------+--------+-----+-----|
          |»|   3   | open  | open  | open | open |  21MB  |  4  | 615 |
          |-+-------+-------+-------+------+------+--------+-----+-----|
          | |   0   |closed |closed |closed|closed|  21MB  |  4  | 612 |
          |-+-------+-------+-------+------+------+--------+-----+-----|
          | |   1   | open  |closed | open |closed|  10MB  |  4  | 306 |
          |-+-------+-------+-------+------+------+--------+-----+-----|
          | |   2   |closed | open  |closed| open |  10MB  |  2  | 615 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |           DRIVE TYPE CONFIGURATION (WDXT-GEN2R)            |
          |------------------------------------------------------------|
          |         |Drive 0|Drive 1|      |      |        |           |
          |---------+-------+-------+------+------+--------+-----------|
          | |Table #|  R17  |  R18  | R19  | R20  |Capacity|Heads|Cyls.|
          |-+-------+-------+-------+------+------+--------+-----+-----|
          |»|   3   | open  | open  | open | open |  32MB  |  4  | 615 |
          |-+-------+-------+-------+------+------+--------+-----+-----|
          | |   0   |closed |closed |closed|closed|  65MB  |  6  | 820 |
          |-+-------+-------+-------+------+------+--------+-----+-----|
          | |   1   | open  |closed | open |closed|  42MB  |  4  | 782 |
          |-+-------+-------+-------+------+------+--------+-----+-----|
          | |   2   |closed | open  |closed| open |  21MB  |  2  | 782 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     ADDRESS SELECTION                      |
          |------------------------------------------------------------|
          |  Controller Address  | BIOS Address  |   R21    |   R22    |
          |----------------------+---------------+----------+----------|
          | »    |   320-323h    | C8000-C9FFFh  |   open   |   open   |
          |------+---------------+---------------+----------+----------|
          |      |   324-327h    | CA000-CBFFFh  |  closed  |   open   |
          |------+---------------+---------------+----------+----------|
          |      |   328-32Bh    | CC000-CDFFFh  |   open   |  closed  |
          |------+---------------+---------------+----------+----------|
          |      |   32C-32Fh    | CE000-CFFFFh  |  closed  |  closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               MISCELLANEOUS TECHNICAL NOTES                |
          |------------------------------------------------------------|
          |  The controller has a built-in low level format. To enter  |
          | the program run the DEBUG utility supplied with DOS and at |
          |                 the prompt enter: G=C800:5                 |
          +------------------------------------------------------------+