
SCIENTIFIC MICRO SYSTEMS, INC.

OMTI 7100, OMTI 7200, OMTI 7400

  Data bus:                   50-pin SCSI interface

  Size:                       5.25" FF

  Hard drive supported:       Up to two ST506/412 MFM drives, up to two
                              ESDI drive

  Floppy drives supported:    Two 360KB, 720KB, 1.2MB, 1.44Mb or 8"
                              drives (except 7100)



[Image]

                            CONNECTIONS

                   Function                          Location

  50-pin SCSI interface                                 J1

  34-pin ESDI or MFM disk control connector             J2

  20-pin data cable connector                           J3

  20-pin data cable connector                           J4

  34-pin floppy drive connector (not in 7100)           J7

  50-pin tape drive connector (7400 only)               J8

  DC power connector                                   J10

                        USER CONFIGURABLE SETTINGS

                Function                     Location          Setting

     SCSI parity enabled                       W4             closed

     SCSI parity disabled                      W4              open

     Spindle motor starts on power up          W5             closed
      (used with ESDI)

     Spindle motor starts on command           W5              open
      only (used with ESDI)

     ST506/412 interface for drive             W6              open
      select 1 enabled

     ESDI interface for drive select           W6             closed
      1 enabled

     ST506/412 interface for drive             W7              open
      select 2 enabled

     ESDI interface for drive select           W7             closed
      2 enabled

     Factory configured - do not               W8               N/A
      alter

     Factory configured - do not               W9               N/A
      alter

     Factory configured - do not              W10               N/A
      alter

     Factory configured - do not              W11               N/A
      alter

     Factory configured - do not              W12               N/A
      alter

     Factory configured - do not              W13               N/A
      alter

     TRMPWR supplied by board            W14/pins 1 & 2       closed

     TRMPWR supplied by SCSI bus         W14/pins 2 & 3       closed

     Ready signal from pin 2 to FDC           W15              open
      765 disabled

     Ready signal from pin 2 to FDC           W15             closed
      765 enabled

     Ready signal from pin 34 to FDC          W16              open
      765 disabled

     Ready signal from pin 34 to FDC          W16             closed
      765 enabled

     Factory configured - do not              W17               N/A
      alter

     Motor on signal delay enabled            W18              open

     Motor on signal enabled                  W18             closed

     Factory configured - do not              W21               N/A
      alter

     Factory configured - do not              W22               N/A
      alter

     QIC-02 (tape drive) parity               W25             closed
      enabled (7400 only)

     QIC-02 (tape drive) parity               W25              open
      disabled (7400 only)

     Factory configured - do not              W29               N/A
      alter

     Disk change detection from FDD           W37             closed
      connector pin 2 enabled

     Disk change detection from FDD           W37              open
      connector pin 2 disabled

     Disk change detection from FDD           W38             closed
      connector pin 34 enabled

     Disk change detection from FDD           W38              open
      connector pin 34 disabled

     Clear disk change signal                 W39              open
      disabled

     Clear disk change signal enabled    W39/pins 1 & 2       closed

            Note: Drive select 1 & 2 refer to the drive select jumper
            setting on the drive itself and should be set to 1 & 2
            respectively.

            When W39/pins 1 & 2 closed drive select 4 must not be used.

            Jumpers W15, W16, W17, W18, W37, W38, W39 refer to flexible
            disk drives and apply only to models 7200 & 7400.

                               SCSI ADDRESS

     SCSI ID              W1                 W2                 W3

          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             close

          7            closed             closed             closed

