ADAPTEC, INC.

AHA-3980, AHA-3985

Data Bus                32-bit PCI
Card Size               Three-quarter length, full-height card
Card Drives supported   Up to 14 Fast SCSI devices (model AHA-3980)

                        Up to 21 Fast SCSI devices (model AHA-3985)
Floppy drives supported None


[Image]

                                CONNECTIONS

       Function           Location          Function           Location

  50-pin SCSI channel        J1       50-pin SCSI channel         J9
  A connector -                       B connector -
  external                            internal

  4-pin connector -          J6       50-pin SCSI channel         J10
  drive active LED                    C connector -
                                      internal (model
                                      AHA-3985 only)

  50-pin SCSI channel        J8
  A connector -
  internal

                        USER CONFIGURABLE SETTINGS

                  Function                      Label        Position

  »   Channel A bus is connected to one           J2           Open
      computer only

      Channel A bus is shared by two              J2          Closed
      computers

  »   Channel B bus is connected to one           J3           Open
      computer only

      Channel B bus is shared by two              J3          Closed
      computers

  »   Channel C bus is connected to one           J4           Open
      computer (AHA-3985 only)

      Channel C bus is shared by two              J4          Closed
      computers (AHA-3985 only)

  »   Host computer supports PCI interrupts      J13           Open
      A, B, C, & D

      Host computer supports PCI interrupts      J13          Closed
      A & B only

                       MISCELLANEOUS TECHNICAL NOTES

            Jumpers J2, J3 and J4 enable other adapter cards on different
            computers to share devices on

            channels A, B, or C (model AHA-3985) with this adapter card.
            Device access is sequential.