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

   ACB-2072

   +------------------------------------------------------------+
   |------------------------------------------------------------|
   | Data bus:                | 8-bit, ISA                      |
   |--------------------------+---------------------------------|
   | Size:                    | Half-length, full-height card   |
   |--------------------------+---------------------------------|
   | Hard drives supported:   | Two RLL ST506 drives            |
   |--------------------------+---------------------------------|
   | Floppy drives supported: | None                            |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/c/A-B/20012-1.png>
   

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

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Location | Setting |
   |---------------------------------------+----------+---------|
   |>> | BIOS enabled                      |    BD    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | BIOS disabled                     |    BD    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | I/O port address is 320h          |   324    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | I/O port address is 324h          |   324    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 0 is defined with Jumpers   |    AB    |  open   |
   |   | MN & OP                           |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Drive 0 is a Syquest drive        |    AB    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 1 is defined with Jumpers   |    CD    |  open   |
   |   | QR & ST                           |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Drive 1 is a Syquest drive        |    CD    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Factory configured - do not alter |    EF    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | Factory configured - do not alter |    GH    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | Factory configured - do not alter |    IJ    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | Normal Operation                  |    KL    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Self-diagnostics enabled          |    KL    | closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        BIOS ADDRESS                        |
   |------------------------------------------------------------|
   |       Select       |     Jumper WX     |     Jumper UV     |
   |--------------------+-------------------+-------------------|
   |>> |     C800h      |       open        |       open        |
   |---+----------------+-------------------+-------------------|
   |   |     CA00h      |       open        |      closed       |
   |---+----------------+-------------------+-------------------|
   |   |     F800h      |      closed       |       open        |
   |---+----------------+-------------------+-------------------|
   |   |     CC00h      |      closed       |      closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   BIOS DRIVE TYPE TABLE                    |
   |------------------------------------------------------------|
   | Table | Hds | Cyls | RLL Cap. |   Jumper MN   | Jumper OP- |
   |   #   |     |      |          |    Drive 0    |  Drive 0   |
   |       |     |      |          |               |            |
   |       |     |      |          |  Jumper QR-   | Jumper ST- |
   |       |     |      |          |    Drive 1    |  Drive 1   |
   |-------+-----+------+----------+---------------+------------|
   |  0    |  4  | 612  |  32.74MB |    closed     |   closed   |
   |-------+-----+------+----------+---------------+------------|
   |  1    |  2  | 612  |  16.29MB |    closed     |    open    |
   |-------+-----+------+----------+---------------+------------|
   |  2    |  5  | 981  |  65.29MB |     open      |   closed   |
   |-------+-----+------+----------+---------------+------------|
   |  3    |  4  | 615  |  32.58MB |     open      |    open    |
   +------------------------------------------------------------+