WESTERN DIGITAL CORPORATION
===========================

   WD1003V-MM1/MM2, WD1006V-MM1/MM2

   Replaces the WD1003-WAH/WA2

   and WD1006-WAH/WA2 respectively

   Data bus: 16-bit, PC/AT

   Size: Full-length, full-height card

   Hard drives supported:  Two MFM ST506/412 drives

   Floppy drives supported: WD100xV-MM2:Two 360KB, 720KB, 1.2MB,
   or 1.44MB

   WD100xV-MM1:None

   Maximum heads/cyl.: 16 heads and 2048 cylinders

<gopher://bitreich.org/I/th99/c/U-Z/20222-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                  |    Location    |
   |-------------------------------------------+----------------|
   | 34-pin data cable connector-floppy drive  |       J1       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 1       |       J3       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 0       |       J4       |
   |-------------------------------------------+----------------|
   | 34-pin control cable connector-hard drive |       J5       |
   |-------------------------------------------+----------------|
   | 4-pin connector-drive active LED          |       J6       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              |  Location   | Setting |
   |------------------------------------+-------------+---------|
   | Hard drives in latched mode        | W1/jumper 1 |  open   |
   |------------------------------------+-------------+---------|
   | Hard drives in non-latched mode    | W1/jumper 1 | closed  |
   |------------------------------------+-------------+---------|
   | 4 byte ECC                         | W1/jumper 2 |  open   |
   |------------------------------------+-------------+---------|
   | 7 byte ECC                         | W1/jumper 2 | closed  |
   |------------------------------------+-------------+---------|
   | Caching enabled                    | W1/jumper 3 |  open   |
   |------------------------------------+-------------+---------|
   | Caching disabled                   | W1/jumper 3 | closed  |
   |------------------------------------+-------------+---------|
   | Not WD1003-WAH/WA2 compatible      | W1/jumper 4 |  open   |
   |------------------------------------+-------------+---------|
   | WD1003-WAH/WA2 compatible          | W1/jumper 4 | closed  |
   |------------------------------------+-------------+---------|
   | Hard drive port address is         |     W3      |  open   |
   | 1F0-1F7h                           |             |         |
   |------------------------------------+-------------+---------|
   | Hard drive port address is         |     W3      | closed  |
   | 170-177h                           |             |         |
   |------------------------------------+-------------+---------|
   | Floppy drive port address is       |     W4      |  open   |
   | 3F0-3F7h                           |             |         |
   |------------------------------------+-------------+---------|
   | Floppy drive port address is       |     W4      | closed  |
   | 370-377h                           |             |         |
   |------------------------------------+-------------+---------|
   | Single speed floppy drive          |     W5      |  open   |
   | supported                          |             |         |
   |------------------------------------+-------------+---------|
   | Dual speed floppy drive supported  |     W5      | closed  |
   |------------------------------------+-------------+---------|
   | Bracket ground option disabled     |     W6      |  open   |
   |------------------------------------+-------------+---------|
   | Bracket to board ground connected  |     W6      | closed  |
   +------------------------------------------------------------+