
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)

[Image]

                           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    Drive
               0        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    Drive
               0        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

