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

   ACB-2370

   Data bus:                16-bit, ISA                           
   Size:                    Half-length, full-height card         
   Hard drives supported:   Two RLL ST506/412 drives              
   Floppy drives supported: None                                  

<gopher://bitreich.org/I/th99/c/A-B/20461-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                  |    Location    |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 1       |       J1       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 0       |       J2       |
   |-------------------------------------------+----------------|
   | 34-pin control cable connector-hard drive |       J3       |
   |-------------------------------------------+----------------|
   | 3-pin connector-drive active LED          |       J5       |
   |-------------------------------------------+----------------|
   | Serial monitor output                     |      J10       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |            Function             |  Location   |  Setting   |
   |---------------------------------+-------------+------------|
   |>> | Hard drive port address     | J6/jumper 1 |    open    |
   |   | 1F0-1F7h                    |             |            |
   |---+-----------------------------+-------------+------------|
   |   | Hard drive port address     | J6/jumper 1 |   closed   |
   |   | 170-177h                    |             |            |
   |---+-----------------------------+-------------+------------|
   |>> | Zero wait state enabled     | J6/jumper 3 |    open    |
   |---+-----------------------------+-------------+------------|
   |   | Zero wait state disabled    | J6/jumper 3 |   closed   |
   |---+-----------------------------+-------------+------------|
   |>> | 35 m sec step rate and      | J6/jumper 4 |    open    |
   |   | recalibrate to 0 minus 1    |             |            |
   |---+-----------------------------+-------------+------------|
   |   | 16 m sec step rate and      | J6/jumper 4 |   closed   |
   |   | recalibrate to 0            |             |            |
   |---+-----------------------------+-------------+------------|
   |>> | Serial monitor mode         | J6/jumper 6 |    open    |
   |   | disabled                    |             |            |
   |---+-----------------------------+-------------+------------|
   |   | Serial monitor mode enabled | J6/jumper 6 |   closed   |
   |   | (2400 baud)                 |             |            |
   |---+-----------------------------+-------------+------------|
   |>> | Hard drive Interrupt is     |     J13     | pins 1 & 2 |
   |   | IRQ14                       |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | Hard drive Interrupt is     |     J13     | pins 2 & 3 |
   |   | IRQ15                       |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |>> | BIOS address C800h          |     J14     | pins 1 & 2 |
   |   |                             |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | BIOS address CC00h          |     J14     | pins 2 & 3 |
   |   |                             |             |   closed   |
   |---+-----------------------------+-------------+------------|
   |   | BIOS disabled               |     J14     |  all pins  |
   |   |                             |             |    open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   | Jumpers J6/jumper 2 and J6/jumper 5 are not used. Jumpers  |
   | J4, J7, J8, J9, J11, J12 and J15 are for factory tests and |
   |   should not be altered. Pins 3 & 4 on jumper J13 should   |
   |  never be closed. J13 or J14 should never have more than   |
   |                 two pins closed at a time.                 |
   +------------------------------------------------------------+