
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.

