WESTERN DIGITAL CORPORATION

WD1003A-WA2

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 Two 360KB or 1.2MB drives

[Image]

                                CONNECTIONS

         Function           Label            Function             Label

  2-pin drive active LED      J1       34-pin control cable        J4
                                       connector - hard drive

  20-pin data cable           J2       34-pin cable connector      J5
  connector - drive 2                  - floppy drive

  20-pin data cable           J3
  connector - drive 1

                        USER CONFIGURABLE SETTINGS

                 Setting                    Label          Position

  »   Factory configured - do not alter       W1       Pins 1 & 2 closed

  »   Factory configured - do not alter      W2/A            Open

  »   Factory configured - do not alter      W2/B            Open

  »   Factory configured - do not alter      W2/C            Open

  »   RWC-NOT signal enabled                  W5       Pins 1 & 2 closed

      RWC-NOT signal disabled, HS3-NOT        W5       Pins 2 & 3 closed
      signal enabled

  »   Factory configured - do not alter       W6         Unidentified

  »   Factory configured - do not alter       W7             Open

            Note:W6 may not be present on all versions of this board.

                        HARD DRIVE 1 TYPE SELECTION

                Setting                                 W3

  »               Standard                       Pins 1 & 2 closed

                   SyQuest                        Pins 1 & 2 open

                        HARD DRIVE 2 TYPE SELECTION

                Setting                                 W3

  »               Standard                       Pins 3 & 4 closed

                   SyQuest                        Pins 3 & 4 open

                       HARD DRIVE ADDRESS SELECTION

                 Setting                                W4

  »                Primary                       Pins 3 & 5 closed

                  Secondary                      Pins 1 & 3 closed

                      FLOPPY DRIVE ADDRESS SELECTION

                 Setting                                W4

  »                Primary                       Pins 4 & 6 closed

                  Secondary                      Pins 2 & 4 closed