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