WESTERN DIGITAL CORPORATION

WD1002S-WX2

Data bus: 8-bit, PC/XT

Size: Full-length, half-height card

Hard drives supported: Two MFM ST506/412 drives

Floppy drives supported: None

[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

                        USER CONFIGURABLE SETTINGS

               Function                    Location           Setting

      Reserved for BIOS                      SW1/8             open

      Reserved for BIOS                      SW1/7             open

      Reserved for BIOS Virtual              SW1/6             open
      option

      Reserved for BIOS Auto-config          SW1/5             open
      option

  »   Normal operation                        W1             pins 1 & 2
                                                              closed

      Factory test                            W1             pins 2 & 3
                                                              closed

  »   Normal operation                        W2             pins 1 & 2
                                                              closed

      Factory test                            W2             pins 2 & 3
                                                              closed

  »   BIOS enabled                            W3              closed

      BIOS disabled                           W3               open

  »   I/O port address 320h                   W4             pins 2 & 3
                                                              closed

      I/O port address 324h                   W4             pins 1 & 2
                                                              closed

  »   BIOS size 32K or 64K                    W5             pins 1 & 2
      (hard-wired)                                            closed

      BIOS size 16K                           W5             pins 2 & 3
                                                              closed

  »   8 Head hard drive with RWC              W6             pins 2 & 3
      supported                                               closed

      16 head hard drive supported            W6             pins 1 & 2
      (Head Select 3)                                         closed

  »   Hard Drive Interrupt is IRQ5            W7             pins 1 & 2
      (hard-wired)                                            closed

      Hard Drive Interrupt is IRQ2            W7             pins 2 & 3
                                                              closed

                        BIOS DRIVE TYPE TABLE - SW1

                     JUMPERS 1 AND 2 CONFIGURE DRIVE 1

                     JUMPERS 3 AND 4 CONFIGURE DRIVE 0

  #    Jumper 1     Jumper 2    Cap.    Hds.     Cyls.      WP      RWC
         & 3          & 4

  0     closed      closed      21MB      4       612      613      613

  1      open       closed      10MB      2       612      128      128

  2     closed       open       21MB      4       612      128      613

  3      open        open       10MB      4       306       all     306
                                                           (0)

                       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.