
ADAPTEC, INC.

AHA-1520, AHA-1522

Data

bus:                     16-bit, ISA
Size:                    Half-length, full-height card
Hard drives supported:   Up to seven SCSI devices
Floppy drives supported: Two 360KB, 720KB, 1.2MB or 1.44MB

[Image]

                          CONNECTIONS

                  Function                       Location

  34-pin data cable connector-floppy drive          CN1

  50-pin SCSI cable connector-internal              CN2

  50-pin SCSI cable connector-external              CN3

                        USER CONFIGURABLE SETTINGS

              Function                     Location           Setting

     Data transfer in DMA disabled      J5/jumper 1            open

      Data transfer in DMA enabled       J5/jumper 1           closed

     Boot enabled (Intercept INT19      J5/jumper 2           closed
      call)

      Boot disabled (INT19 normal)       J5/jumper 2            open

     Synchronous negotiation            J5/jumper 5           closed
      enabled

      Synchronous negotiation            J5/jumper 5            open
      disabled

     Disconnect by target / INT15       J5/jumper 6           closed
      enabled

      Disconnect by target / INT15       J5/jumper 6            open
      disabled

     Factory configured - do not      J5/jumpers 7 & 8         open
      alter

                        USER CONFIGURABLE SETTINGS

              Function                     Location           Setting

     SCSI parity check enabled          J6/jumper 8            open

      SCSI parity check disabled         J6/jumper 8           closed

     Floppy drive enabled               J7/jumper 1           closed

      Floppy drive disabled              J7/jumper 1            open

     Floppy drive Interrupt is          J7/jumper 6           closed
      IRQ6

      Floppy drive Interrupt is          J7/jumper 7           closed
      IRQ10

     Floppy drive-dual speed            J7/jumper 8            open
      disabled

      Floppy drive-dual speed            J7/jumper 8           closed
      enabled

     I/O port address 340h              J9/jumper 5            open

      I/O port address 140h              J9/jumper 5           closed

                               SCSI ADDRESS

    SCSI ID         J6/jumper 1        J6/jumper 2         J6/jumper 3

          0            open                open               open

          1           closed               open               open

          2            open               closed              open

          3           closed              closed              open

          4            open                open              closed

          5           closed               open              closed

          6            open               closed             closed

         7           closed              closed             closed

                                DMA CHANNEL

   DMA       J6/6       J6/7      J8/1 &    J8/2 &     J8/3 &    J8/4 & 8
                                    5         6          7

      7     closed     closed    closed      open      open        open

      6      open      closed     open      closed     open        open

      5     closed      open      open       open     closed       open

     0      open       open      open       open      open       closed

                             INTERRUPT REQUEST

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

      IRQ9      open      open      open      open       open     closed

      IRQ10    closed     open      open      open      closed     open

     IRQ11     open     closed     open     closed      open      open

      IRQ12    closed    closed    closed     open       open      open

                               BIOS ADDRESS

       Address          J9/jumper 6       J9/jumper 7       J9/jumper 8

         DC000h           closed           closed            closed

          C8000h            open             open             closed

          CC000h            open            closed            closed

          D8000h           closed            open             closed

         Disabled           N/A               N/A              open

                           FLOPPY DRIVE DMA - J7

                           DRQ           DACK

           DMA          Jumper 2       Jumper 3     Jumper 4    Jumper 5

     DMA Channel 2      closed          open        closed       open

      DMA Channel 3       open          closed        open       closed

                              MESSAGE SELECT

     MSG #0 - ADAPTEC HEADERMSG #1 - JUMPER CONFIG. INFO. MSG #2 - SCSI
                               DEVICE INFO.

            MSG #3 - BOOT PROGRESS INFO.MSG #4 - ERROR MESSAGES

          Message                JP5/jumper 3            JP5/jumper 4

     Msg #0 and #4                  open                    open

      Msg #0, #3 and #4              open                   closed

      All messages                  closed                   open
      displayed

      Msg #4 only                   closed                  closed

