ALPHA RESEARCH CORPORATION
==========================

   S425I ISA

   +------------------------------------------------------------+
   +------------------------------------------------------------+

   Data bus:               16-bit, ISA                            
   Size:                   Three/quarter-length, full-height card 
   Hard drive supported:   Four IDE (AT) interface drives         
   Floppy drives           Two 360KB, 720KB, 1.2MB, or 1.44MB     
   supported:              

<gopher://bitreich.org/I/th99/c/A-B/20309-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                  Purpose                   |   Location    |
   |--------------------------------------------+---------------|
   | IDE drive interface (Primary)              |      CN1      |
   |--------------------------------------------+---------------|
   | IDE drive interface (Secondary)            |      CN2      |
   |--------------------------------------------+---------------|
   | Floppy drive interface                     |      CN3      |
   |--------------------------------------------+---------------|
   | Hard Drive activity LED                    |      JP1      |
   |--------------------------------------------+---------------|
   | Speaker                                    |      JP2      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function              |   Location   | Setting |
   |-----------------------------------+--------------+---------|
   |>> | IDE Bus 1 (CN1) resistors     |     JDR0     |  open   |
   |   | open                          |              |         |
   |---+-------------------------------+--------------+---------|
   |   | IDE Bus 1 (CN1) resistors     |     JDR0     | closed  |
   |   | shorted                       |              |         |
   |---+-------------------------------+--------------+---------|
   |>> | IDE Bus 2 (CN2) resistors     |     JDR1     |  open   |
   |   | open                          |              |         |
   |---+-------------------------------+--------------+---------|
   |   | IDE Bus 2 (CN2) resistors     |     JDR1     | closed  |
   |   | shorted                       |              |         |
   |---+-------------------------------+--------------+---------|
   |>> | Floppy drive enabled          | JP3/jumper 4 | closed  |
   |---+-------------------------------+--------------+---------|
   |   | Floppy drive disabled         | JP3/jumper 4 |  open   |
   |---+-------------------------------+--------------+---------|
   |>> | Primary hard drive enabled    | JP3/jumper 5 | closed  |
   |---+-------------------------------+--------------+---------|
   |   | Secondary hard drive enabled  | JP3/jumper 5 |  open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 BIOS ADDRESS CONFIGURATION                 |
   |------------------------------------------------------------|
   |    Address    | JP3/jumper 1 | JP3/jumper 2 | JP3/jumper 3 |
   |---------------+--------------+--------------+--------------|
   | DC000-DFFFFh  |    closed    |    closed    |    closed    |
   |---------------+--------------+--------------+--------------|
   | DC000-DFFFFh  |    closed    |    closed    |     open     |
   |---------------+--------------+--------------+--------------|
   | D8000-DBFFFh  |    closed    |     open     |    closed    |
   |---------------+--------------+--------------+--------------|
   | D4000-D7FFFh  |    closed    |     open     |     open     |
   |---------------+--------------+--------------+--------------|
   | D0000-D3FFFh  |     open     |    closed    |    closed    |
   |---------------+--------------+--------------+--------------|
   | CC000-CFFFFh  |     open     |    closed    |     open     |
   |---------------+--------------+--------------+--------------|
   | D8000-CBFFFh  |     open     |     open     |    closed    |
   |---------------+--------------+--------------+--------------|
   |   Disabled    |     open     |     open     |     open     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   | When using this controller, the system will see the drives |
   | attached to each connector as a single drive. i.e.: if you |
   | have two 100MB drives attached to CN1 the system will see  |
   |   one 200MB drive. However, if have two drives you would   |
   |  like to be recognize individually, you may attach one to  |
   |                 CN1 and the other to CN2.                  |
   |                                                            |
   | Closing Jumpers JDR0 and JDR1, which shorts the resistors  |
   | on the IDE buses, helps to eliminate drive incompatibility |
   |       caused by different noise filtration methods.        |
   |                                                            |
   | This controller supports 256KB, 1MB, or 4MB fast page mode |
   | SIMM's, 80nsec or faster. At least one bank must be filled |
   |                   for proper operation.                    |
   +------------------------------------------------------------+