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

   WDAT-240

   +------------------------------------------------------------+
   +------------------------------------------------------------+

   Data bus: 16-bit, PC/AT

   Size: Half-length, full-height card

   Hard drives supported:  Two IDE (AT) Interface drives

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

<gopher://bitreich.org/I/th99/c/U-Z/20234-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                    Function                     | Location |
   |-------------------------------------------------+----------|
   | 34-pin data cable connector-floppy drive        |    J1    |
   |-------------------------------------------------+----------|
   | 40-pin AT Interface (IDE) control cable         |    J2    |
   | connector-internal                              |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    DIRQ14 SIGNAL SELECT                    |
   |------------------------------------------------------------|
   |             Function              | Jumper W1 | Jumper W1A |
   |-----------------------------------+-----------+------------|
   |>> | DIRQ14 signal passed to host  |   open    |   closed   |
   |   | computer                      |           |            |
   |---+-------------------------------+-----------+------------|
   |   | Conner CP342/CP3022 in true   |  closed   |    open    |
   |   | IBM AT                        |           |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Location | Setting |
   |---------------------------------------+----------+---------|
   |>> | Floppy controller enabled         |    W2    | closed  |
   |---+-----------------------------------+----------+---------|
   |   | Floppy controller disabled        |    W2    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | Floppy drive port address is      |   W2A    |  open   |
   |   | 3F0-3F7h                          |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Floppy drive port address is      |   W2A    | closed  |
   |   | 370-377h                          |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Single speed floppy drive         |    W3    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Dual-speed floppy drive           |    W3    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Logic ground independent of       |    W4    |  open   |
   |   | chassis                           |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Logic ground connected to chassis |    W4    | closed  |
   +------------------------------------------------------------+