
ADAPTEC, INC.

AHA-1520A, AHA1522A

  Data bus:                  16-bit ISA

  Size:                      Half-length, full-height card

  Hard drive supported:      Up to seven SCSI devices

  Floppy drives supported:   None

[Image]

                        CONNECTIONS

                Function                      Location

  50-pin SCSI connector - external              CN1

  50-pin SCSI connector - internal              CN2

  34-pin floppy controller - 1522A only         CN3

                             SCSI ID SELECTION

     SCSI ID             J6/1               J6/2               J6/3

          7            closed             closed             closed

           0             open               open               open

           1            closed              open               open

           2             open              closed              open

           3            closed             closed              open

           4             open               open              closed

           5            closed               pen              closed

           6             open              closed             closed

                        USER CONFIGURABLE SETTINGS

               Function                     Location          Setting

     Factory configured - do not             J5/1              open
      alter

     INT 19 is re-routed                     J5/2             closed

      INT 19 is not re-routed                 J5/2              open

     Sync. negotiation enabled               J5/5             closed

      Sync. negotiation disabled              J5/5              open

     Disconnect by target SCSI               J5/6             closed
      device enabled

      Disconnect by target SCSI               J5/6              open
      device disabled

     Factory configured - do not             J5/7              open
      alter

     Factory configured - do not             J5/8              open
      alter

     Factory configured - do not             J6/6              open
      alter

     Factory configured - do not             J6/7              open
      alter

     SCSI parity check enabled               J6/8              open

      SCSI parity check disabled              J6/8             closed

     Floppy drive enabled (only on            J7              closed
      1522A)

      Floppy drive disabled (only on           J7               open
      1522A)

     Factory configured - do not            J8/1-8             open
      alter

     Adapter I/O address is 340h             J9/5              open

      Adapter I/O address is 140h             J9/5             closed

     Host adapter BIOS enabled               J9/8             closed

      Host adapter BIOS disabled              J9/8              open

  Note: When connecting both external & internal devices to the host
  adapter - remove terminators

                            MESSAGES AT BOOT-UP

            Message                     J5/3                  J5/4

          Adapter header               open                  open

           Error messages              closed                closed

        Boot progress report            open                 closed

       SCSI device information         closed                 open

                          BIOS ADDRESS SELECTION

          Address                    J9/6                    J9/7

            DFFFFh                 closed                  closed

             CBFFFh                  open                    open

             CFFFFh                  open                   closed

             DBFFFh                 closed                   open

                            INTERRUPT SELECTION

    IRQ       J6/4      J6/5       J9/1      J9/2       J9/3       J9/4

     11      open     closed      open     closed      open       open

       9      open      open       open      open       open      closed

      10     closed     open       open      open      closed      open

      12     closed    closed     closed     open       open       open

