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

   AHA-2840VL, AHA-2842VL

    Data bus:           32-bit VL-Bus                             

    Size:               Full-lengh, full-height card              

    Hard drive          Up to seven SCSI devices                  
    supported:          

    Floppy drives       Two 360KB, 720KB, 1.2MB, or 1.44MB        
    supported:          drives                                    

<gopher://bitreich.org/I/th99/c/A-B/20797-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                 |    Location     |
   |------------------------------------------+-----------------|
   | 4-pin connector - drive active LED       |       J1        |
   |------------------------------------------+-----------------|
   | 34-pin floppy drive connector            |       J2        |
   |------------------------------------------+-----------------|
   | 50-pin SCSI connector - internal         |       J3        |
   |------------------------------------------+-----------------|
   | 50-pin SCSI connector - external         |       J4        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function              |  Location   | Setting  |
   |-----------------------------------+-------------+----------|
   |>>  | Floppy drive enabled         | S1/switch 5 |   off    |
   |----+------------------------------+-------------+----------|
   |    | Floppy drive disabled        | S1/switch 5 |    on    |
   |----+------------------------------+-------------+----------|
   |>>  | Host adapter BIOS enabled    | S1/switch 8 |   off    |
   |----+------------------------------+-------------+----------|
   |    | Host adapter BIOS disabled   | S1/switch 8 |    on    |
   |------------------------------------------------------------|
   |   Note: Disabling the host adapter BIOS for non-disk       |
   |   devices such as CD-ROM drives, tape drives, will reduce  |
   |   boot up time.                                            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   I/O ADDRESS SELECTION                    |
   |------------------------------------------------------------|
   |  Address  |S1/Switch 1 |S1/Switch 2|S1/Switch 3|S1/Switch 4|
   |-----------+------------+-----------+-----------+-----------|
   |>>| 1C000h  |    off     |    off    |    off    |    off    |
   |-+---------+------------+-----------+-----------+-----------|
   | | 2C000h  |     on     |    off    |    off    |    off    |
   |-+---------+------------+-----------+-----------+-----------|
   | | 3C000h  |    off     |    on     |    off    |    off    |
   |-+---------+------------+-----------+-----------+-----------|
   | | 4C000h  |     on     |    on     |    off    |    off    |
   |-+---------+------------+-----------+-----------+-----------|
   | | 5C000h  |    off     |    off    |    on     |    off    |
   |-+---------+------------+-----------+-----------+-----------|
   | | 6C000h  |     on     |    off    |    on     |    off    |
   |-+---------+------------+-----------+-----------+-----------|
   | | 7C000h  |    off     |    on     |    on     |    off    |
   |-+---------+------------+-----------+-----------+-----------|
   | | 8C000h  |     on     |    on     |    on     |    off    |
   |-+---------+------------+-----------+-----------+-----------|
   | | 9C000h  |    off     |    off    |    off    |    on     |
   |-+---------+------------+-----------+-----------+-----------|
   | | AC000h  |     on     |    off    |    off    |    on     |
   |-+---------+------------+-----------+-----------+-----------|
   | | BC000h  |    off     |    on     |    off    |    on     |
   |-+---------+------------+-----------+-----------+-----------|
   | | CC000h  |     on     |    on     |    off    |    on     |
   |-+---------+------------+-----------+-----------+-----------|
   | | DC000h  |    off     |    off    |    on     |    on     |
   |-+---------+------------+-----------+-----------+-----------|
   | | EC000h  |     on     |    off    |    on     |    on     |
   |-+---------+------------+-----------+-----------+-----------|
   | |Reserved |    off     |    on     |    on     |    on     |
   |-+---------+------------+-----------+-----------+-----------|
   | |Reserved |     on     |    on     |    on     |    on     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   BASE ADDRESS SELECTION                   |
   |------------------------------------------------------------|
   |     Address      |    S1/Switch 6     |    S1/Switch 7     |
   |------------------+--------------------+--------------------|
   |      D8000h      |        off         |        off         |
   |------------------+--------------------+--------------------|
   |      C8000h      |         on         |        off         |
   |------------------+--------------------+--------------------|
   |      D0000h      |        off         |         on         |
   |------------------+--------------------+--------------------|
   |      E0000h      |         on         |         on         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |   Only single-ended SCSI devices can be connected to the   |
   |                     AHA-2840VL/2842VL.                     |
   +------------------------------------------------------------+