ADAPTEC, INC.

AHA-1540A, AHA-1542A

Data bus:                16-bit, ISA
Size:                    Full-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

  50-pin SCSI connector-external                    CN1

  50-pin SCSI connector-internal                    CN2

  34-pin data cable connector-floppy drive          CN4

  4-pin connector-drive active LED                  J5

                               SCSI ADDRESS

    SCSI ID
                    J1/jumper 4
                                        J1/jumper 5
                                                           J1/jumper 6

  »
          7
                        open
                                           open
                                                               open


          6
                       closed
                                           open
                                                               open


          5
                        open
                                          closed
                                                               open


          4
                       closed
                                          closed
                                                               open


          3
                        open
                                           open
                                                              closed


          2
                       closed
                                           open
                                                              closed


          1
                        open
                                          closed
                                                              closed


          0
                       closed
                                          closed
                                                              closed

                        USER CONFIGURABLE SETTINGS

               Function                    Location           Setting

  »   Synchronous negotiation             J1/jumper 1           open
      disabled

      Synchronous negotiation             J1/jumper 1          closed
      enabled

  »   Factory test disabled               J1/jumper 2           open

      Factory test enabled                J1/jumper 2          closed

  »   SCSI parity checking enabled        J1/jumper 3           open

      SCSI parity checking disabled       J1/jumper 3          closed

  »   LA enable (Only on early                J8               closed
      W1542A)

      LA disable (Only on early               J8                open
      W1542A)

  »   Auto request sense enabled          J9/jumper 1           open

      Auto request sense disabled         J9/jumper 1          closed

  »   Factory configured - do not       J9/jumpers 2-4          open
      alter

  »   BOIS enabled                            J11              closed

      BIOS disabled                           J11               open

  »   Floppy address 3F0-3F7h                 J12               open

      Floppy address 370-377h                 J12              closed

  »   Floppy drive enabled                    J13              closed

      Floppy drive disabled                   J13               open

  »   Floppy drive Interrupt is IRQ6          J17            pins 1 & 2
                                                               closed

      Floppy drive Interrupt is               J17            pins 2 & 3
      IRQ10                                                    closed

  »   Floppy drive DMA Request is             J18            pins 1 & 2
      DREQ2                                                    closed

      Floppy drive DMA Request is             J18            pins 2 & 3
      DREQ3                                                    closed

  »   Floppy drive DMA Acknowledge            J19            pins 1 & 2
      Is DACK2                                                 closed

      Floppy drive DMA Acknowledge            J19            pins 2 & 3
      is DACK3                                                 closed

                                DMA CHANNEL

    DRQ
              J1/Jumper 7
                              J1/Jumper 8
                                                 J14
                                                                 J15


       0
                 closed
                                closed
                                                Jumper
                                               1-closed
                                                                Jumper
                                                              1-closed

  »
       5
                  open
                                closed
                                                Jumper
                                               2-closed
                                                                Jumper
                                                              2-closed


       6
                 closed
                                 open
                                                Jumper
                                               3-closed
                                                                Jumper
                                                              3-closed


       7
                  open
                                 open
                                                Jumper
                                               4-closed
                                                                Jumper
                                                              4-closed

                             INTERRUPT REQUEST

     IRQ       J1/Jumper 9    J1/Jumper 10   J1/Jumper 11        J16

        9         open            open           open           Jumper
                                                              1-closed

       10        closed           open           open           Jumper
                                                              2-closed

  »    11         open           closed          open           Jumper
                                                              3-closed

       12        closed          closed          open           Jumper
                                                              4-closed

       14         open            open          closed          Jumper
                                                              5-closed

       15        closed           open          closed          Jumper
                                                              6-closed

                             DMA TRANSFER RATE

         Speed
                               J1/jumper 12
                                                        J1/jumper 13

  »
             5.0
                                   open
                                                            open


             5.7
                                  closed
                                                            open


             6.7
                                   open
                                                           closed


             8.0
                                  closed
                                                           closed

                             I/O PORT ADDRESS

     Address          J6/Jumper 1        J6/Jumper 2       J6/Jumper 3

         334h             open              open               open

  »      330h             open              open              closed

         234h             open             closed              open

         230h             open             closed             closed

         134h            closed             open               open

         130h            closed             open              closed

                              BUS WAIT STATE

      Delay
                   J7/jumper 1
                                 J7/jumper 2
                                               J7/jumper 3
                                                             J7/jumper 4

  »
       Disable
                     closed
                                    open
                                                  open
                                                                 open


       100nsec
                      open
                                   closed
                                                  open
                                                                 open


       200nsec
                      open
                                    open
                                                 closed
                                                                 open


       300nsec
                      open
                                    open
                                                  open
                                                                closed

                               BIOS ADDRESS

         Address                J10/jumper 1            J10/jumper 2

  »         DC000h                  open                    open

            CC000h                 closed                   open

            D8000h                  open                   closed

            C8000h                 closed                  closed