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

[Image]

                  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             JP3/jumper 5            open
      enabled

                   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.