ADAPTEC, INC.
=============

   AHA-1540C, AHA-1542C

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

   Data bus:                16-bit, ISA                           
   Size:                    Half-length, full-height card         
   Hard drive supported:    Up to seven SCSI devices              
   Floppy drives supported: 360KB, 720KB, 1.2MB, or 1.44MB (2)    

<gopher://bitreich.org/I/th99/c/A-B/20311-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                  Function                   |   Location   |
   |---------------------------------------------+--------------|
   | SCSI drive interface (50 pin) internal      |     CN1      |
   |---------------------------------------------+--------------|
   | SCSI drive interface (50 pin) external      |     CN2      |
   |---------------------------------------------+--------------|
   | Floppy drive interface (AHA-1542C only)     |     CN3      |
   |---------------------------------------------+--------------|
   | Hard drive activity LED                     |     CN4      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function              |   Location   | Setting |
   |-----------------------------------+--------------+---------|
   |>> | SCSI Termination set with     | SW1/switch 1 |   off   |
   |   | configuration software        |              |         |
   |---+-------------------------------+--------------+---------|
   |   | SCSI Termination enabled      | SW1/switch 1 |   on    |
   |---+-------------------------------+--------------+---------|
   |>> | Floppy drive enabled          | SW1/switch 5 |   off   |
   |---+-------------------------------+--------------+---------|
   |   | Floppy drive disabled         | SW1/switch 5 |   on    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               I/O PORT ADDRESS CONFIGURATION               |
   |------------------------------------------------------------|
   |  Address   | SW1/switch 2  | SW1/switch 3  | SW1/switch 4  |
   |------------+---------------+---------------+---------------|
   |  330-333h  |      off      |      off      |      off      |
   |------------+---------------+---------------+---------------|
   |  334-337h  |      on       |      off      |      off      |
   |------------+---------------+---------------+---------------|
   |  230-233h  |      off      |      on       |      off      |
   |------------+---------------+---------------+---------------|
   |  234-237h  |      on       |      on       |      off      |
   |------------+---------------+---------------+---------------|
   |  130-133h  |      off      |      off      |      on       |
   |------------+---------------+---------------+---------------|
   |  134-137h  |      on       |      off      |      on       |
   |------------+---------------+---------------+---------------|
   |  Reserved  |      off      |      on       |      on       |
   |------------+---------------+---------------+---------------|
   |  Reserved  |      on       |      on       |      on       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 BIOS ADDRESS CONFIGURATION                 |
   |------------------------------------------------------------|
   |  Address   | SW1/switch 6  | SW1/switch 7  | SW1/switch 8  |
   |------------+---------------+---------------+---------------|
   |   DC000h   |      off      |      off      |      off      |
   |------------+---------------+---------------+---------------|
   |   D8000h   |      on       |      off      |      off      |
   |------------+---------------+---------------+---------------|
   |   D4000h   |      off      |      on       |      off      |
   |------------+---------------+---------------+---------------|
   |   D0000h   |      on       |      on       |      off      |
   |------------+---------------+---------------+---------------|
   |   CC000h   |      off      |      off      |      on       |
   |------------+---------------+---------------+---------------|
   |   C8000h   |      on       |      off      |      on       |
   |------------+---------------+---------------+---------------|
   |  Reserved  |      off      |      on       |      on       |
   |------------+---------------+---------------+---------------|
   |  Disabled  |      on       |      on       |      on       |
   +------------------------------------------------------------+