SCIENTIFIC MICRO SYSTEMS, INC.
==============================

   OMTI 7100, OMTI 7200, OMTI 7400

   +------------------------------------------------------------+
   |------------------------------------------------------------|
   | Data bus:     | 50-pin SCSI interface                      |
   |---------------+--------------------------------------------|
   | Size:         | 5.25" FF                                   |
   |---------------+--------------------------------------------|
   | Hard drive    | Up to two ST506/412 MFM drives, up to two  |
   | supported:    | ESDI drive                                 |
   |---------------+--------------------------------------------|
   | Floppy drives | Two 360KB, 720KB, 1.2MB, 1.44Mb or 8"      |
   | supported:    | drives (except 7100)                       |
   |---------------+--------------------------------------------|
   |               |                                            |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/c/S-T/20699-1.png>
   

   +------------------------------------------------------------+
   |                        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 |     W5     |  closed  |
   |    | up (used with ESDI)           |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Spindle motor starts on       |     W5     |   open   |
   |    | command only (used with ESDI) |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | ST506/412 interface for drive |     W6     |   open   |
   |    | select 1 enabled              |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | ESDI interface for drive      |     W6     |  closed  |
   |    | select 1 enabled              |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | ST506/412 interface for drive |     W7     |   open   |
   |    | select 2 enabled              |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | ESDI interface for drive      |     W7     |  closed  |
   |    | select 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 |  closed  |
   |    |                               |    & 2     |          |
   |----+-------------------------------+------------+----------|
   |>>  | TRMPWR supplied by SCSI bus   | W14/pins 2 |  closed  |
   |    |                               |    & 3     |          |
   |----+-------------------------------+------------+----------|
   |>>  | Ready signal from pin 2 to    |    W15     |   open   |
   |    | FDC 765 disabled              |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Ready signal from pin 2 to    |    W15     |  closed  |
   |    | FDC 765 enabled               |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Ready signal from pin 34 to   |    W16     |   open   |
   |    | FDC 765 disabled              |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Ready signal from pin 34 to   |    W16     |  closed  |
   |    | FDC 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    |    W37     |  closed  |
   |    | FDD connector pin 2 enabled   |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Disk change detection from    |    W37     |   open   |
   |    | FDD connector pin 2 disabled  |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Disk change detection from    |    W38     |  closed  |
   |    | FDD connector pin 34 enabled  |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Disk change detection from    |    W38     |   open   |
   |    | FDD connector pin 34 disabled |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Clear disk change signal      |    W39     |   open   |
   |    | disabled                      |            |          |
   |----+-------------------------------+------------+----------|
   |>>  | Clear disk change signal      | W39/pins 1 |  closed  |
   |    | enabled                       |    & 2     |          |
   |------------------------------------------------------------|
   |      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    |
   +------------------------------------------------------------+