WESTERN DIGITAL CORPORATION

WD1006-WAH (VER. 2)

Chipset                 Western Digital
Data Bus                16-bit ISA
Card Size               Full height, full length
Hard Drives Supported   Two ST506/412(MFM) devices
Floppy Drives Supported None

[Image]

                                CONNECTIONS

         Function           Label            Function             Label

  4-pin drive active LED      J1       20-pin data cable           J3
                                       connector - drive 1

  20-pin data cable           J2       34-pin control cable        J4
  connector - drive 2                  connector - hard drive

                        USER CONFIGURABLE SETTINGS

                   Setting                      Label        Position

  »   Drives up to 16 heads supported;           W1          Pins 1 & 2
      reduced write current disabled                          closed

      Drives up to 8 heads supported;            W1          Pins 2 & 3
      reduced write current enabled                           closed

  »   Card uses primary I/O address              W3          Pins 1 & 2
                                                              closed

      Card uses secondary I/O address            W3          Pins 2 & 3
                                                              closed

  »   Factory configured - do not alter          W5            Open

  »   Factory configured - do not alter          W6            Open

  »   Factory configured - do not alter          W7            Open

  »   Factory configured - do not alter          W8            Open

  »   Hard drive caching enabled                 W9            Open

      Hard drive caching disabled                W9           Closed

  »   Signal ground not connected to             W11           Open
      chassis ground

      Signal ground connected to chassis         W11          Closed
      ground

                           WAIT STATE SELECTION

        Setting               W2/A            W2/B              W2/C

  »       Disabled            Open            Open              Open

  »    0 wait states         Closed           Open              Open

        1 wait state          Open           Closed             Open

       2 wait states          Open            Open             Closed

            Note:On some versions of this board (designated F001), wait
            state circuitry is not included. Set these boards to the
            Disabled setting. All other boards should be set to one of
            the other three settings.

                          DRIVE LED CONFIGURATION

              Setting                       W4                 W10

    Non-latched; LED is on when           Closed              Open
          drive is active

  Latched; LED is on when drive is         Open              Closed
            not active