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       # UNIDENTIFIED
       
          EXPERT TOP HFDC
       
          +------------------------------------------------------------+
          |------------------------------------------------------------|
          | Data bus:         | 16-bit ISA                             |
          |-------------------+----------------------------------------|
          | Size:             | Three/quarter-length, full-height card |
          |-------------------+----------------------------------------|
          | Hard drive        | Two MFM ST506/412 drives               |
          | supported:        |                                        |
          |-------------------+----------------------------------------|
          | Floppy drives     | Two 360KB, 720KB, 1.2MB, 1.44MB drives |
          | supported:        |                                        |
          +------------------------------------------------------------+
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |                  Function                   |   Location   |
          |---------------------------------------------+--------------|
          | 34-pin control cable connector - hard drive |      J1      |
          |---------------------------------------------+--------------|
          | 20-pin data cable connector - drive 1       |      J2      |
          |---------------------------------------------+--------------|
          | 20-pin data cable connector - drive 0       |      J3      |
          |---------------------------------------------+--------------|
          | 34-pin connector - floppy drive interface   |      J4      |
          |---------------------------------------------+--------------|
          | 2-pin connector - drive active LED          |      J6      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function              | Location |  Setting   |
          |------------------------------------+----------+------------|
          | » | Floppy drive interface         |    W1    | pins 1 & 2 |
          |   | operates at 360 RPM            |          |   closed   |
          |---+--------------------------------+----------+------------|
          |   | Floppy drive interface         |    W1    | pins 2 & 3 |
          |   | operates at 300 RPM            |          |   closed   |
          |---+--------------------------------+----------+------------|
          | » | Floppy drive is primary in     |    W4    | pins 2 & 3 |
          |   | system (3F2 - 3F7h)            |          |   closed   |
          |---+--------------------------------+----------+------------|
          |   | Floppy drive is secondary in   |    W4    | pins 1 & 2 |
          |   | system (372 - 377h)            |          |   closed   |
          |---+--------------------------------+----------+------------|
          | » | ST506/412(MFM) interface is    |    W6    | pins 2 & 3 |
          |   | primary in system (1F0 - 1F7h) |          |   closed   |
          |---+--------------------------------+----------+------------|
          |   | ST506/412(MFM) interface is    |    W6    | pins 1 & 2 |
          |   | secondary in system (170 -     |          |   closed   |
          |   | 177h)                          |          |            |
          +------------------------------------------------------------+