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

   ACB-2320B

   +------------------------------------------------------------+
   |------------------------------------------------------------|
   | Data bus:                | 16-bit, ISA                     |
   |--------------------------+---------------------------------|
   | Size:                    | Full-length, full-height card   |
   |--------------------------+---------------------------------|
   | Hard drives supported:   | Two RLL ESDI drives             |
   |--------------------------+---------------------------------|
   | Floppy drives supported: | None                            |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/c/A-B/20015-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                  |    Location    |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 0       |       J1       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 1       |       J2       |
   |-------------------------------------------+----------------|
   | 34-pin control cable connector-hard drive |       J3       |
   |-------------------------------------------+----------------|
   | 4-pin connector-drive active LED          |       J4       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |            Function             |  Location   |  Setting   |
   |---------------------------------+-------------+------------|
   |>> | Hard drive address 1F0-1F7h | J5/jumper 1 |    open    |
   |---+-----------------------------+-------------+------------|
   |   | Hard drive address 170-177h | J5/jumper 1 |   closed   |
   |---+-----------------------------+-------------+------------|
   |>> | Zero wait state enabled     | J5/jumper 3 |    open    |
   |---+-----------------------------+-------------+------------|
   |   | Zero wait state disabled    | J5/jumper 3 |   closed   |
   |---+-----------------------------+-------------+------------|
   |>> | Read ahead cache enabled    | J5/jumper 5 |    open    |
   |---+-----------------------------+-------------+------------|
   |   | Read ahead cache disabled   | J5/jumper 5 |   closed   |
   |---+-----------------------------+-------------+------------|
   |>> | Hard Drive Interrupt is     |     J12     | pins 1 & 2 |
   |   | IRQ14                       |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | Hard Drive Interrupt is     |     J12     | pins 2 & 3 |
   |   | IRQ15                       |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | Not used                    |     J12     | pins 3 & 4 |
   |   |                             |             |    open    |
   |---+-----------------------------+-------------+------------|
   |>> | BIOS address C800h          |     J13     | pins 1 & 2 |
   |   |                             |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | BIOS address CC00h          |     J13     | pins 2 & 3 |
   |   |                             |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | BIOS disabled               |     J13     |    open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |            J5/jumpers 2, 4, 6 & 7 are Not used.            |
   +------------------------------------------------------------+