WESTERN DIGITAL CORPORATION

WD1003-RAH, WD1003-WAH

Replaced by the WD1003V-SR1

and WD1003V-MM1 respectively

Data bus: 16-bit, PC/AT

Size: Full-length, full-height card

Hard drives supported: WD1003-RAH: Two RLL ST506/412 drives

WD1003-WAH: Two MFM ST506/412 drives

Floppy drives supported: None

[Image]

                         CONNECTIONS

                 Function                      Location

  34-pin data cable connector-hard drive          J1

  20-pin data cable connector-drive 0             J2

  20-pin data cable connector-drive 1             J3

  4-pin connector-drive active LED                J6

                  USER CONFIGURABLE SETTING - WD1003-RAH

               Function                     Location          Setting

  »    Auto deselect enabled (PC/AT)           W1              closed

       Auto deselect disabled (Compaq)         W1               open

  »    Hard drive port address is              W2               open
       1F0-1F7 & 3F0-3F7h

       Hard drive port address is              W2              closed
       170-177 & 370-377h

       WD11C00C-22 chip at U8 or if            W3               open
       W5/pins 2-3 closed

       WD11C00-22 chip at U8 & W5/pins         W3              closed
       1-2 closed

  »    Drive 0 translation disabled            W4            pins 2 & 3
                                                               closed

       Drive 0 translation enabled             W4            pins 1 & 2
                                                               closed

  »    Write gate and drive select             W5            pins 2 & 3
       lines enabled                                           closed

       only when drive is accessed

       Write gate and drive select             W5            pins 1 & 2
       lines are disabled during                               closed
       power-up and when +5V is <
       +4.15V

  »    Drive 1 logical translation             W6            pins 2 & 3
       disabled                                                closed

       Drive 1 logical translation             W6            pins 1 & 2
       enabled                                                 closed

                  USER CONFIGURABLE SETTINGS - WD1003-WAH

               Function                    Location           Setting

  »    Auto deselect enabled (PC/AT)          W1              closed

       Auto deselect disabled                 W1               open
       (Compaq)

  »    Hard drive port address is             W2               open
       1F0-1F7 & 3F0-3F7

       Hard drive port address is             W2              closed
       170-177 & 370-377

       WD11C00A-22 chip at U8 or if           W3               open
       W5/pins 2-3 closed

       WD11C00-22 chip at U8 &                W3              closed
       W5/pins 1-2 closed

  »    Ties firmware sense bit high           W4             pins 2 & 3
                                                              closed

       Supports 2 head, 612 cyl.              W4             pins 1 & 2
       second drive with tandard                              closed
       system setup for 4 head, 306
       cyl. drive

  »    Write gate and drive select            W5             pins 2 & 3
       lines enabled                                          closed

       only when drive is accessed

       Write gate and drive select            W5             pins 1 & 2
       lines are disabled during                              closed
       power-up and when +5V is <
       +4.15V

  »    Ties input high, 35 m                  W6             pins 2 & 3
                                                              closed

       Ties input low, 16 m                   W6             pins 1 & 2
                                                              closed