DISTRIBUTED PROCESSING TECHNOLOGY

PM2021A/90, PM2021A/95

Data bus:                  16-bit, ISA (PM2021A/9x)
Size:                      Half-length, full-height card
Hard drive supported:      Up to seven SCSI drives
Floppy drives supported:   Two 360KB, 720KB, 1.2MB, or 1.44MB drives
                           (PM2x2x/95 only)

[Image]

                          CONNECTIONS

                   Function                       Location

  CM4000 Cache Module Connector                      P1

  CM4000 Cache Module Connector                      P2

  DM4000 Disk Array Module Connector                 P5

  4-pin connector-Drive active LED                   P6

  DM400 Disk Array Module Connector                  P7

  34-pin control cable connector-floppy drive        P8

  50-pin SCSI connector - internal                   P10

  50-pin SCSI connector - external                   J11

                             DMA TRANSFER RATE

          Speed             Jumper Y12      Jumper Y13       Jumper Y14

           10MB/sec            open            open             open

           8MB/sec            closed           open             open

         6.667MB/sec           open           closed            open

          5.7MB/sec           closed          closed            open

  »       5.0MB/sec            open            open            closed

          4.4MB/sec           closed           open            closed

          4.0MB/sec            open           closed           closed

          3.0MB/sec           closed          closed           closed

                               SCSI ADDRESS

     SCSI I.D.         Jumper Y18        Jumper Y25         Jumper Y26

           0              open              open               open

           1              open             closed              open

           2             closed             open               open

           3             closed            closed              open

           4              open              open              closed

           5              open             closed             closed

           6             closed             open              closed

  »        7             closed            closed             closed

                             INTERRUPT REQUEST

             IRQ                       Y29                   Y30

             Disabled                 open                   open

              IRQ12                   open                  closed

  »           IRQ15                  closed                  open

              IRQ14                  closed                 closed

                                DMA CHANNEL

            DRQ                      Y31                     Y32

             DRQ0                   open                    open

             DRQ7                   open                   closed

             DRQ6                  closed                   open

  »          DRQ5                  closed                  closed

                             I/O PORT ADDRESS

          Address                    Y33                     Y35

             230h                   open                    open

  »          170h                   open                   closed

             330h                  closed                   open

             1F0h                  closed                  closed

                               BIOS ADDRESS

           Address                     Y36                   Y37

             Disabled                 open                   open

              DC00h                   open                  closed

              D800h                  closed                  open

  »           C800h                  closed                 closed

                        USER CONFIGURABLE SETTINGS

               Function                    Location           Setting

  »   DMA duty cycle is fast                  Y15               open

      DMA duty cycle is slow                  Y15              closed

  »   SCSI termination enabled                Y16              closed

      SCSI termination disabled               Y16               open

  »   Address LInes SA17-19 and               Y19              closed
      LA17-19 driven

      Only Address LInes LA17-19              Y19               open
      driven

  »   Floppy drive enabled                    Y20              closed

      Floppy drive disabled                   Y20               open

  »   Bus Mastering enabled                   Y24              closed

      Bus Mastering disabled                  Y24               open

  »   BIOS ROM size is 8K                     Y38               open

      BIOS ROM size is 16K                    Y38              closed

  »   External SCSI cable detection           Y39               open
      disabled

      External SCSI cable detection           Y39              closed
      enabled*

  »   Controller supplies TERMPWR to          Y50              closed
      SCSI interface 26

      TERMPWR not supplied to SCSI            Y50               open
      Interface 26

                    STATUS LED'S

     LED                    Definition

    LED 1       Busy

    LED 2       Computer Bus Transfer to Adapter

    LED 3       Computer Bus Transfer from Adapter

    LED 4       Cache Hit

    LED 5       Disk Read-Ahead Active

    LED 6       Disk Read

    LED 7       Disk Write

    LED 8       Adapter Reset

    LED 9       Interrupt Pending to Computer

    LED 10      DRQ Asserted to Computer

                       MISCELLANEOUS TECHNICAL NOTES

      Detection of an external SCSI cable limits the maximum SCSI bus
                         transfer rate to 5MB/sec.

                  The function of Jumper Y34 is unknown.