
ADAPTEC, INC.

AHA-1540B, AHA-1542B

(Also Sold as the Maynard HA-101S)

Data bus:                16-bit, ISA
Size:                    Three-quarter length, full-height card
Hard drives supported:   Up to seven SCSI devices
Floppy drives supported: Two 360KB, 720KB, 1.2MB or 1.44MB (AHA-1542B)

                         None (AHA-1540B, HA-101S)

[Image]

                          CONNECTIONS

                  Function                       Location

  34-pin data cable connector-floppy drive          CN1

  50-pin SCSI connector-internal                    CN2

  50-pin SCSI connector-external                    CN3

  4-pin connector-drive active LED                  CN4

                               SCSI ADDRESS

     Select          J5/jumper 4        J5/jumper 5        J5/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

     SCSI synchronous negotiation       J5/jumper 1            open
      disabled

      SCSI synchronous negotiation       J5/jumper 1           closed
      enabled

     Normal operation                   J5/jumper 2            open

      Self diagnostics enabled           J5/jumper 2           closed

     SCSI parity check enabled          J5/jumper 3            open

      SCSI parity check disabled         J5/jumper 3           closed

     BIOS enabled                       J6/jumper 1           closed

      BIOS disabled                      J6/jumper 1            open

     Not used                          J6/jumpers 2-4          open

     Auto sense enabled                 J6/jumper 5            open

      Auto sense disable                 J6/jumper 5           closed

     Floppy drive port address          J7/jumper 1            open
      3F0-3F7h

      Floppy drive port address          J7/jumper 1           closed
      370-377h

     Floppy drive enabled               J8/jumper 1           closed

      Floppy drive disabled              J8/jumper 1            open

     Floppy drive DMA Request is        J8/jumper 2           closed
      DREQ2

      Floppy drive DMA Request is        J8/jumper 3           closed
      DREQ3

     Floppy drive DMA Acknowledge       J8/jumper 4           closed
      Is DACK2

      Floppy drive DMA Acknowledge       J8/jumper 5           closed
      is DACK3

     Floppy drive Interrupt is          J8/jumper 6           closed
      IRQ6

      Floppy drive Interrupt is          J8/jumper 7           closed
      IRQ10

     Floppy drive dual speed            J8/jumper 8            open
      disabled

      Floppy drive dual speed            J8/jumper 8           closed
      enabled

     AT Bus DMA Request is DREQ5        J9/jumper 2           closed

      AT Bus DMA Request is DREQ0        J9/jumper 1           closed

      AT Bus DMA Request is DREQ6        J9/jumper 3           closed

      AT Bus DMA Request is DREQ7        J9/jumper 4           closed

      AT Bus DMA Acknowledge is          J9/jumper 5           closed
      DACK0

     AT Bus DMA Acknowledge is          J9/jumper 6           closed
      DACK5

      AT Bus DMA Acknowledge is          J9/jumper 7           closed
      DACK6

      AT Bus DMA Acknowledge is          J9/jumper 8           closed
      DACK7

      Hard drive Interrupt is IRQ9       J9/jumper 9           closed

      Hard drive Interrupt is IRQ10      J9/jumper 10          closed

     Hard drive Interrupt is IRQ11      J9/jumper 11          closed

      Hard drive Interrupt is IRQ12      J9/jumper 12          closed

      Hard drive Interrupt is IRQ14      J9/jumper 13          closed

      Hard drive Interrupt is IRQ15      J9/jumper 14          closed

                                DMA CHANNEL

          DRQ                 J5/jumper 7               J5/jumper 8

            5                   open                     closed

             6                  closed                     open

             7                   open                      open

             0                  closed                    closed

                             INTERRUPT REQUEST

       IRQ          J5/jumper 9        J5/jumper 10       J5/jumper 11

          9             open               open               open

         10            closed              open               open

        11             open              closed              open

         12            closed             closed              open

         14             open               open              closed

         15            closed              open              closed

                             DMA TRANSFER RATE

           Speed                J5/jumper 12            J5/jumper 13

            5.0Mb/s                 open                    open

           5.7Mb/s                closed                   open

            6.7Mb/s                 open                   closed

            8.0Mb/s                closed                  closed

                             I/O PORT ADDRESS

      Address         J7/jumper 2        J7/jumper 3       J7/jumper 4

         334h           open              open               open

         330h           closed             open               open

          234h            open             closed              open

          230h           closed            closed              open

          134h            open              open              closed

          130h           closed             open              closed

        Not used         closed            closed             closed

  Note:  denotes default for 1540BS11/1542BS11

                              BUS WAIT STATE

         Wait Time               J7/jumper 5             J7/jumper 6

           Disable                 open                    open

            100nsec                closed                   open

            200nsec                 open                   closed

            300nsec                closed                  closed

                       MISCELLANEOUS TECHNICAL NOTE

   Note: Manufacturer documentation does not specify possible BIOS memory
   addresses, but a selection of DC00:6 has been recommended by some card
                                  users.

