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

   ACB-2002A, ACB-2010A

   Data bus:                8-bit, ISA                            
   Size:                    Full-length, full-height card         
   Hard drives supported:   Two MFM ST506 drives                  
   Floppy drives supported: None                                  

<gopher://bitreich.org/I/th99/c/A-B/20009-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                  |    Location    |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 0       |       J0       |
   |-------------------------------------------+----------------|
   | 20-pin data cable connector-drive 1       |       J1       |
   |-------------------------------------------+----------------|
   | 34-pin control cable connector-hard drive |       J2       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |           USER CONFIGURABLE SETTINGS - ACB-2002A           |
   |------------------------------------------------------------|
   |              Function               | Location  | Setting  |
   |-------------------------------------+-----------+----------|
   |>> | Step Rate is: 13 m              |    AB     |  closed  |
   |   |                                 |           |          |
   |   | 200 m                           |           |          |
   |---+---------------------------------+-----------+----------|
   |   | Step Rate is: 70 m              |    AB     |   open   |
   |   |                                 |           |          |
   |   | 3msec with step code 3          |           |          |
   |---+---------------------------------+-----------+----------|
   |>> | Not used                        |    CD     |   open   |
   |---+---------------------------------+-----------+----------|
   |>> | Wedge servo enabled             |    EF     |  closed  |
   |---+---------------------------------+-----------+----------|
   |   | Dedicated track servo enabled   |    EF     |   open   |
   |---+---------------------------------+-----------+----------|
   |>> | Not used                        |    GH     |   open   |
   |---+---------------------------------+-----------+----------|
   |>> | Not used                        |    IJ     |   open   |
   |---+---------------------------------+-----------+----------|
   |>> | Normal operation                |    KL     |   open   |
   |---+---------------------------------+-----------+----------|
   |   | Self diagnotics enabled         |    KL     |  closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |       DRIVE TYPE CONFIGURATION - DRIVE 0 - ACB 2010A       |
   |------------------------------------------------------------|
   |              Type               |   CD   |   EF   |   MN   |
   |---------------------------------+--------+--------+--------|
   | Drive is hard sectored lomega   | closed |  open  | closed |
   | Beta-5                          |        |        |        |
   |---------------------------------+--------+--------+--------|
   | Drive is Syquest 312 or DMA 360 |  open  | closed |  N/A   |
   | drive                           |        |        |        |
   |---------------------------------+--------+--------+--------|
   | Drive is soft sectored ST506    |  open  |  open  |  N/A   |
   | type                            |        |        |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |       DRIVE TYPE CONFIGURATION - DRIVE 1 - ACB 2010A       |
   |------------------------------------------------------------|
   |              Type               |   GH   |   IJ   |   QR   |
   |---------------------------------+--------+--------+--------|
   | Drive is hard sectored lomega   | closed |  open  | closed |
   | Beta-5                          |        |        |        |
   |---------------------------------+--------+--------+--------|
   | Drive is Syquest 312 or DMA 360 |  open  | closed |  N/A   |
   | drive                           |        |        |        |
   |---------------------------------+--------+--------+--------|
   | Drive is soft sectored ST506    |  open  |  open  |  N/A   |
   | type                            |        |        |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              BIOS DRIVE TYPE TABLE ACB-2010A               |
   |------------------------------------------------------------|
   | Table | Heads | Cylinders | Capacity | MN-Drive | OP-Drive |
   |   #   |       |           |          |    0     |    0     |
   |       |       |           |          |          |          |
   |       |       |           |          | QR-Drive | ST-Drive |
   |       |       |           |          |    1     |    1     |
   |-------+-------+-----------+----------+----------+----------|
   |   0   |   2   |    612    | 10.65MB  |  closed  |  closed  |
   |-------+-------+-----------+----------+----------+----------|
   |   1   |   2   |    306    |  5.32MB  |  closed  |   open   |
   |-------+-------+-----------+----------+----------+----------|
   |   2   |   4   |    480    | 16.71MB  |   open   |  closed  |
   |-------+-------+-----------+----------+----------+----------|
   |   3   |   4   |    306    | 10.65MB  |   open   |   open   |
   +------------------------------------------------------------+

   +-------------------------------------------+
   |       MISCELLANEOUS TECHNICAL NOTES       |
   |-------------------------------------------|
   |     Jumpers WX, UV, YZ are Not used.      |
   |                                           |
   | Jumper EF is Not used on Model ACB-2010A. |
   +-------------------------------------------+