ADAPTEC, INC.

ACB-4525S4000, ACB-4525Z

  Data bus:                  None (SCSI to ESDI interface)

  Size:                      Drive card

  Hard drives supported:     SCSI to two RLL ESDI drives

  Floppy drives supported:   None

[Image]

A diagram for these Models was not available, the ACB-4000A is pictured
above.

                             CONNECTIONS

                    Function                          Location

  20-pin data cable connector-drive 0                    CN0

  20-pin data cable connector-drive 1                    CN1

  34-pin control cable connector-hard drive(s)           CN2

  4-pin connector-DC power                               CN3

  50-pin SCSI connector-to host adapter                  CN4

                               SCSI ADDRESS

    SCSI ID        JP5/Jumper 1       JP5/Jumper 2        JP5/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

                        USER CONFIGURABLE SETTINGS

               Function                     Location          Setting

  »   Not used                                JP2               N/A

  »   Provides a protocol compatible      JP5/jumper 4         closed
      with ACB-5500 and ACB-4000
      families of controllers
      (4525S4000 only)

      Does not allow for                  JP5/jumper 4          open
      compatibility with ACB-5500

      and ACB-4000 controllers
      (4525S4000 only)

  »   Zero latency default enabled        JP5/jumper 4         closed
      (4525Z only)

      Zero latency default disabled       JP5/jumper 4          open
      (4525Z only)

  »   Spindle motor starts on command     JP5/jumper 5         closed

      Spindle motor starts on             JP5/jumper 5          open
      power-up

  »   SCSI unit attention disabled        JP5/jumper 6         closed

      SCSI unit attention enabled         JP5/jumper 6          open

  »   SCSI parity check enabled           JP5/jumper 7         closed

      SCSI parity check disabled          JP5/jumper 7          open

  »   Normal operation                    JP5/jumper 8          open

      Self-diagnostic enabled             JP5/jumper 8         closed

                       MISCELLANEOUS TECHNICAL NOTES

      The function of JP1 is to determine the select technique used to
                        interface the host adapter.

   Soldering Pin-2 to Pin "P" allows for the "pulse" select that is used
  by controllers designed to work with SCSI hosts. Soldering Pin-2 to Pin
   "H" or "L" allows for the "handshake" or "level" select signal used in
                      accordance with SCSI standards.

       Unit attention (JP5/6) is not supported if the JP5/4 jumper is
                      installed on the ACB-4525S4000.