UNIDENTIFIED
============

   FD/HD/TD Controller

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

   Data bus: 16-bit,ISA

   Size: Half-length, half-height card

   Hard drives supported:  Two MFM ST506 drives

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

   Sector interleave: 1:1

<gopher://bitreich.org/I/th99/c/U-Z/20204-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                  Function                   |   Location   |
   |---------------------------------------------+--------------|
   | 34-pin control cable connector-floppy drive |      J1      |
   |---------------------------------------------+--------------|
   | 50-pin control cable connector-tape drive   |      J2      |
   |---------------------------------------------+--------------|
   | 20-pin data cable connector-drive 0         |      J3      |
   |---------------------------------------------+--------------|
   | 20-pin data cable connector-drive 1         |      J4      |
   |---------------------------------------------+--------------|
   | 34-pin control cable connector-hard drive   |      J5      |
   |---------------------------------------------+--------------|
   | 2-pin connector-drive active LED            |      J6      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                TAPE DRIVE I/O PORT ADDRESS                 |
   |------------------------------------------------------------|
   | Address  |   Jumper W4    |   Jumper W5    |   Jumper W6   |
   |----------+----------------+----------------+---------------|
   |   | 208h |   pins 2 & 3   |   pins 1 & 2   |  pins 1 & 2   |
   |   |      |     closed     |     closed     |    closed     |
   |---+------+----------------+----------------+---------------|
   |   | 108h |   pins 1 & 2   |   pins 2 & 3   |  pins 1 & 2   |
   |   |      |     closed     |     closed     |    closed     |
   |---+------+----------------+----------------+---------------|
   |   | 218h |   pins 2 & 3   |   pins 1 & 2   |  pins 2 & 3   |
   |   |      |     closed     |     closed     |    closed     |
   |---+------+----------------+----------------+---------------|
   |>> | 118h |   pins 1 & 2   |   pins 2 & 3   |  pins 2 & 3   |
   |   |      |     closed     |     closed     |    closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Location |  Setting   |
   |------------------------------------+----------+------------|
   |>> | Reserved for Phase Lock Loop   |    W1    | pins 1 & 2 |
   |   | Feedback circuit               |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Reserved for Read Gate         |    W1    | pins 1 & 2 |
   |   |                                |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Floppy drive port address is   |    W7    | pins 2 & 3 |
   |   | 3F0-3F7h                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Floppy drive port address is   |    W7    | pins 1 & 2 |
   |   | 370-377h                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Hard drive port address is     |    W8    | pins 2 & 3 |
   |   | 1F0-1F7h                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |   | Hard drive port address is     |    W8    | pins 1 & 2 |
   |   | 170-177h                       |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Reserved for Read Data Window  |    W9    | pins 1 & 2 |
   |   |                                |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Reserved for Read Data Window  |   W10    | pins 1 & 2 |
   |   |                                |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Frame ground and signal ground |   W11    | pins 1 & 2 |
   |   |                                |          |   closed   |
   |---+--------------------------------+----------+------------|
   |>> | Frame ground and signal ground |   W12    | pins 1 & 2 |
   |   |                                |          |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     INTERRUPT REQUEST                      |
   |------------------------------------------------------------|
   |  IRQ   |SW1/switch 1|SW1/switch 2|SW1/switch 3|SW1/switch 4|
   |--------+------------+------------+------------+------------|
   | |IRQ10 |     on     |    off     |    off     |    off     |
   |-+------+------------+------------+------------+------------|
   | |IRQ11 |    off     |     on     |    off     |    off     |
   |-+------+------------+------------+------------+------------|
   | |IRQ12 |    off     |    off     |     on     |    off     |
   |-+------+------------+------------+------------+------------|
   |>>|IRQ15 |    off     |    off     |    off     |     on     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        DMA CHANNEL                         |
   |------------------------------------------------------------|
   | Channel  | SW1/switch 5 | SW1/switch 6 | SW1/switch 7 and  |
   |          |    and 8     |    and 9     |        10         |
   |----------+--------------+--------------+-------------------|
   |>> | DRQ5 |      on      |     off      |        off        |
   |---+------+--------------+--------------+-------------------|
   |   | DRQ6 |     off      |      on      |        off        |
   |---+------+--------------+--------------+-------------------|
   |   | DRQ7 |     off      |     off      |        on         |
   +------------------------------------------------------------+