WESTERN DIGITAL CORPORATION

WD1002A-27X

Replaced by the WD1004A-27X

Data bus: 8-bit, PC/XT

Size: Half-length, full-height card

Hard drives supported: Two RLL ST506/412 drives

Floppy drives supported: None

Maximum heads/cyl.: 16 heads and 1024 cylinders

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                           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

                        USER CONFIGURABLE SETTINGS

   Mode             Mode Description             Jumper        Position

      »      Supports low-level and dynamic
             low-level formatting. Performs
      »      logical translations; (i.e.-4         W1           closed
             hds., 615 cyls. and 26 SPT would
      1      be seen by DOS as 4 hds. 940          W2           closed
             cyls. 17 SPT. Supports only up
             to 16 heads and 663 cylinders
             (physical).

             Supports low-level and dynamic        W1            open
             low-level formatting. Does not
      2      do logical translation. Supports      W2            open
             up to 16 heads and 1024
             cylinders (physical).

                       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.