WESTERN DIGITAL CORPORATION

WD1007A-WAH, WD1007A-WA2

Data bus: 16-bit, PC/AT

Size: Full-length, full-height card

Hard Drives Supported: Two ESDI drives

Floppy drives supported: WD1007A-WA2: Two 360KB, 720KB, 1.2MB, or 1.44MB

WD1007A-WAH: None

Sector interleave: 1:1

Options: Feature F301R has an optional ROM BIOS with shadow RAM enabling
the controller to interface with all types of ESDI drives by bypassing the
systems ROM BIOS drive type tables. Feature F300R does not include ROM BIOS
option and system ROM BIOS must contain appropriate drive parameters.

.

[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

  34-pin data cable connector-floppy drive           J4

  4-pin connector-drive active LED                   J5

                       MISCELLANEOUS TECHNICAL NOTES

   This controller has a built-in low-level format program. To enter the
     program run the DEBUG utility supplied with DOS and at the prompt
                             enter: G=C800:5.

                        USER CONFIGURABLE SETTINGS

                  Function                     Location        Setting

  »   BIOS shadow RAM enabled                     W1           closed

      BIOS shadow RAM disabled                    W1            open

  »   Floppy controller enabled                   W4            open
      (WD1007A-WA2 only)

      Floppy controller disabled                  W4           closed
      (WD1007A-WA2 only)

  »   Single speed floppy drive select            W5            open
      (WD1007A-WA2 only)

      Dual speed floppy drive select              W5           closed
      (WD1007A-WA2 only)

  »   Floppy drive port address is                W6          pins 2 & 3
      3F0-3F7h                                                 closed

      Floppy drive port address is                W6          pins 1 & 2
      370-377h                                                 closed

  »   WD1007A-WA2 supports 5.25 & 3.5             W7           closed
      floppy drives

  »   WD1007 emulation mode                       W8            open

      WD1005 emulation mode                       W8           closed

  »   Chassis ground disconnected                 W9            open

      Digital ground disconnected                 W9          pins 1 & 2
                                                               closed

      Chassis ground connected                    W9          pins 2 & 3
                                                               closed

  »   Digital input register unlatched           W10            open

      Digital input register latched             W10           closed

  »   Diskette change input signal enabled       W11           closed
      (WD1007A-WA2 only)

      Diskette change input signal               W11            open
      disabled (WD1007A-WA2 only)

  »   Hard drive port address is 1F0-1F7h        W12            open

      Hard drive port address is 170-177h        W12           closed

  »   Floppy controller enabled (In              W13            uncut
      etch)(WD1007A-WA2 only)

      Floppy controller disabled (In             W13             cut
      etch)(WD1007A-WA2 only)

  »   Sector translation enabled                 W14            open

      Sector translation disabled                W14           closed

  »   ECC length is 4 bytes                      W15            open

      ECC length is 7 bytes                      W15           closed

                               BIOS ADDRESS

         Address                 W1              W2              W3

  »      C8000-C9FFFh        pins 2 & 3       pins 2 & 3       closed
                               closed          closed

         CA000-CBFFFh        pins 2 & 3       pins 1 & 2       closed
                               closed          closed

         CC000-CDFFFh        pins 1 & 2       pins 2 & 3       closed
                               closed          closed

         CE000-CFFFFh        pins 1 & 2       pins 1 & 2       closed
                               closed          closed