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

   AHA-1540A, AHA-1542A

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

<gopher://bitreich.org/I/th99/c/A-B/20027-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                 |    Location     |
   |------------------------------------------+-----------------|
   | 50-pin SCSI connector-external           |       CN1       |
   |------------------------------------------+-----------------|
   | 50-pin SCSI connector-internal           |       CN2       |
   |------------------------------------------+-----------------|
   | 34-pin data cable connector-floppy drive |       CN4       |
   |------------------------------------------+-----------------|
   | 4-pin connector-drive active LED         |       J5        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        SCSI ADDRESS                        |
   |------------------------------------------------------------|
   |  SCSI ID   |  J1/jumper 4  |  J1/jumper 5  |  J1/jumper 6  |
   |------------+---------------+---------------+---------------|
   |>>  |   7   |     open      |     open      |     open      |
   |----+-------+---------------+---------------+---------------|
   |    |   6   |    closed     |     open      |     open      |
   |----+-------+---------------+---------------+---------------|
   |    |   5   |     open      |    closed     |     open      |
   |----+-------+---------------+---------------+---------------|
   |    |   4   |    closed     |    closed     |     open      |
   |----+-------+---------------+---------------+---------------|
   |    |   3   |     open      |     open      |    closed     |
   |----+-------+---------------+---------------+---------------|
   |    |   2   |    closed     |     open      |    closed     |
   |----+-------+---------------+---------------+---------------|
   |    |   1   |     open      |    closed     |    closed     |
   |----+-------+---------------+---------------+---------------|
   |    |   0   |    closed     |    closed     |    closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |            Function            |   Location   |  Setting   |
   |--------------------------------+--------------+------------|
   |>> | Synchronous negotiation    | J1/jumper 1  |    open    |
   |   | disabled                   |              |            |
   |---+----------------------------+--------------+------------|
   |   | Synchronous negotiation    | J1/jumper 1  |   closed   |
   |   | enabled                    |              |            |
   |---+----------------------------+--------------+------------|
   |>> | Factory test disabled      | J1/jumper 2  |    open    |
   |---+----------------------------+--------------+------------|
   |   | Factory test enabled       | J1/jumper 2  |   closed   |
   |---+----------------------------+--------------+------------|
   |>> | SCSI parity checking       | J1/jumper 3  |    open    |
   |   | enabled                    |              |            |
   |---+----------------------------+--------------+------------|
   |   | SCSI parity checking       | J1/jumper 3  |   closed   |
   |   | disabled                   |              |            |
   |---+----------------------------+--------------+------------|
   |>> | LA enable (Only on early   |      J8      |   closed   |
   |   | W1542A)                    |              |            |
   |---+----------------------------+--------------+------------|
   |   | LA disable (Only on early  |      J8      |    open    |
   |   | W1542A)                    |              |            |
   |---+----------------------------+--------------+------------|
   |>> | Auto request sense enabled | J9/jumper 1  |    open    |
   |---+----------------------------+--------------+------------|
   |   | Auto request sense         | J9/jumper 1  |   closed   |
   |   | disabled                   |              |            |
   |---+----------------------------+--------------+------------|
   |>> | Factory configured - do    |  J9/jumpers  |    open    |
   |   | not alter                  |     2-4      |            |
   |---+----------------------------+--------------+------------|
   |>> | BOIS enabled               |     J11      |   closed   |
   |---+----------------------------+--------------+------------|
   |   | BIOS disabled              |     J11      |    open    |
   |---+----------------------------+--------------+------------|
   |>> | Floppy address 3F0-3F7h    |     J12      |    open    |
   |---+----------------------------+--------------+------------|
   |   | Floppy address 370-377h    |     J12      |   closed   |
   |---+----------------------------+--------------+------------|
   |>> | Floppy drive enabled       |     J13      |   closed   |
   |---+----------------------------+--------------+------------|
   |   | Floppy drive disabled      |     J13      |    open    |
   |---+----------------------------+--------------+------------|
   |>> | Floppy drive Interrupt is  |     J17      | pins 1 & 2 |
   |   | IRQ6                       |              |   closed   |
   |---+----------------------------+--------------+------------|
   |   | Floppy drive Interrupt is  |     J17      | pins 2 & 3 |
   |   | IRQ10                      |              |   closed   |
   |---+----------------------------+--------------+------------|
   |>> | Floppy drive DMA Request   |     J18      | pins 1 & 2 |
   |   | is DREQ2                   |              |   closed   |
   |---+----------------------------+--------------+------------|
   |   | Floppy drive DMA Request   |     J18      | pins 2 & 3 |
   |   | is DREQ3                   |              |   closed   |
   |---+----------------------------+--------------+------------|
   |>> | Floppy drive DMA           |     J19      | pins 1 & 2 |
   |   | Acknowledge Is DACK2       |              |   closed   |
   |---+----------------------------+--------------+------------|
   |   | Floppy drive DMA           |     J19      | pins 2 & 3 |
   |   | Acknowledge is DACK3       |              |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        DMA CHANNEL                         |
   |------------------------------------------------------------|
   |  DRQ  | J1/Jumper 7 | J1/Jumper |     J14      |    J15    |
   |       |             |     8     |              |           |
   |-------+-------------+-----------+--------------+-----------|
   |   | 0 |   closed    |  closed   |    Jumper    |  Jumper   |
   |   |   |             |           |   1-closed   | 1-closed  |
   |---+---+-------------+-----------+--------------+-----------|
   |>> | 5 |    open     |  closed   |    Jumper    |  Jumper   |
   |   |   |             |           |   2-closed   | 2-closed  |
   |---+---+-------------+-----------+--------------+-----------|
   |   | 6 |   closed    |   open    |    Jumper    |  Jumper   |
   |   |   |             |           |   3-closed   | 3-closed  |
   |---+---+-------------+-----------+--------------+-----------|
   |   | 7 |    open     |   open    |    Jumper    |  Jumper   |
   |   |   |             |           |   4-closed   | 4-closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     INTERRUPT REQUEST                      |
   |------------------------------------------------------------|
   |  IRQ   | J1/Jumper | J1/Jumper | J1/Jumper |      J16      |
   |        |     9     |    10     |    11     |               |
   |--------+-----------+-----------+-----------+---------------|
   |   | 9  |   open    |   open    |   open    |    Jumper     |
   |   |    |           |           |           |   1-closed    |
   |---+----+-----------+-----------+-----------+---------------|
   |   | 10 |  closed   |   open    |   open    |    Jumper     |
   |   |    |           |           |           |   2-closed    |
   |---+----+-----------+-----------+-----------+---------------|
   |>> | 11 |   open    |  closed   |   open    |    Jumper     |
   |   |    |           |           |           |   3-closed    |
   |---+----+-----------+-----------+-----------+---------------|
   |   | 12 |  closed   |  closed   |   open    |    Jumper     |
   |   |    |           |           |           |   4-closed    |
   |---+----+-----------+-----------+-----------+---------------|
   |   | 14 |   open    |   open    |  closed   |    Jumper     |
   |   |    |           |           |           |   5-closed    |
   |---+----+-----------+-----------+-----------+---------------|
   |   | 15 |  closed   |   open    |  closed   |    Jumper     |
   |   |    |           |           |           |   6-closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DMA TRANSFER RATE                      |
   |------------------------------------------------------------|
   |      Speed       |    J1/jumper 12    |    J1/jumper 13    |
   |------------------+--------------------+--------------------|
   |>> |     5.0      |        open        |        open        |
   |---+--------------+--------------------+--------------------|
   |   |     5.7      |       closed       |        open        |
   |---+--------------+--------------------+--------------------|
   |   |     6.7      |        open        |       closed       |
   |---+--------------+--------------------+--------------------|
   |   |     8.0      |       closed       |       closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      I/O PORT ADDRESS                      |
   |------------------------------------------------------------|
   |  Address   |  J6/Jumper 1  |  J6/Jumper 2  |  J6/Jumper 3  |
   |------------+---------------+---------------+---------------|
   |   |  334h  |     open      |     open      |     open      |
   |---+--------+---------------+---------------+---------------|
   |>> |  330h  |     open      |     open      |    closed     |
   |---+--------+---------------+---------------+---------------|
   |   |  234h  |     open      |    closed     |     open      |
   |---+--------+---------------+---------------+---------------|
   |   |  230h  |     open      |    closed     |    closed     |
   |---+--------+---------------+---------------+---------------|
   |   |  134h  |    closed     |     open      |     open      |
   |---+--------+---------------+---------------+---------------|
   |   |  130h  |    closed     |     open      |    closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       BUS WAIT STATE                       |
   |------------------------------------------------------------|
   |  Delay   |J7/jumper 1 |J7/jumper 2 |J7/jumper 3|J7/jumper 4|
   |----------+------------+------------+-----------+-----------|
   |>>|Disable |   closed   |    open    |   open    |   open    |
   |-+--------+------------+------------+-----------+-----------|
   | |100nsec |    open    |   closed   |   open    |   open    |
   |-+--------+------------+------------+-----------+-----------|
   | |200nsec |    open    |    open    |  closed   |   open    |
   |-+--------+------------+------------+-----------+-----------|
   | |300nsec |    open    |    open    |   open    |  closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        BIOS ADDRESS                        |
   |------------------------------------------------------------|
   |     Address      |    J10/jumper 1    |    J10/jumper 2    |
   |------------------+--------------------+--------------------|
   |>> |    DC000h    |        open        |        open        |
   |---+--------------+--------------------+--------------------|
   |   |    CC000h    |       closed       |        open        |
   |---+--------------+--------------------+--------------------|
   |   |    D8000h    |        open        |       closed       |
   |---+--------------+--------------------+--------------------|
   |   |    C8000h    |       closed       |       closed       |
   +------------------------------------------------------------+