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