WESTERN DIGITAL CORPORATION

WD1007A-WA4

Data Bus                16-bit
Card Size               Full-length, full-height card
Hard Drives supported   Two ESDI drives
Sector Interleave       1:1
Floppy drives supported Two 360KB or 720KB drives

[Image]

                                CONNECTIONS

           Function              Function

  4-pin connector-drive             J1         34-pin data cable      J5
  active LED                                   connector-floppy
                                               drive

  20-pin data cable                 J2         9-pin serial port -    J6
  connector-drive 1                            external

  20-pin data cable                 J3         25-pin parallel        J7
  connector-drive 0                            port - external

  34-pin data cable                 J4
  connector-controller board

                        USER CONFIGURABLE SETTINGS

                Function                      Label           Position

  »   Primary floppy address 3FX          W1/pins 1 & 2        closed

      Floppy controller disabled          W1/pins 2 & 3        closed

      Secondary floppy address 37X        W1/pins 3 & 4        closed

  »   Primary hard disk address 1FX       W2/pins 1 & 2        closed

      Secondary hard disk address 17X     W2/pins 2 & 3        closed

  »   Primary parallel port address 37X   W3/pins 1 & 2        closed

      Parallel port disabled              W3/pins 2 & 3        closed

      Secondary port address 27X          W3/pins 3 & 4        closed

  »   Primary serial port address 3FX     W4/pins 1 & 2        closed

      Serial port disabled                W4/pins 2 & 3        closed

      Secondary serial port address 2FX   W4/pins 3 & 4        closed

  »   Digital input register,                   W9              open
      non-latched

      Digital input register, latched           W9             closed

  »   WD 1007 mode                        W16/pins 1 & 2        open

      WD 1005 mode                        W16/pins 1 & 2       closed

  »   Translation enabled                 W16/pins 3 & 4        open

      Translation disabled                W16/pins 3 & 4       closed

  »   ECC correction, 4 bytes             W16/pins 5 & 6        open

      ECC correction, 7 bytes             W16/pins 5 & 6       closed

                          BIOS ADDRESS SELECTION

          Address                W13            W14              W15

  »      C8000h-C9FFFh           N/A         Pins 2 & 3       Pins 2 & 3
                                               closed          closed

         CA000-CBFFFh            N/A         Pins 2 & 3       Pins 1 & 2
                                               closed          closed

         CC000-CDFFFh            N/A         Pins 1 & 2       Pins 2 & 3
                                               closed          closed

          CE00-CFFFh           Closed        Pins 1 & 2       Pins 1 & 2
                                               closed          closed

         BIOS disabled          Open            N/A              N/A

                       MISCELLANEOUS TECHNICAL NOTES

            Note: This controller has a built-in low-level format
            program. To enter the program, run the BIOS routine through
            the DOS DEBUG utility and at the prompt enter: G=C800:5.