SCIENTIFIC MICRO SYSTEMS
========================

   OMTI 8600, 8610

   +------------------------------------------------------------+
   |------------------------------------------------------------|
   | Data bus:         | 16-bit, ISA                            |
   |-------------------+----------------------------------------|
   | Size:             | Full-length, full-height card          |
   |-------------------+----------------------------------------|
   | Hard drives       | Two MFM ST506/ST412 drives or ESDI     |
   | supported:        | drives                                 |
   |-------------------+----------------------------------------|
   | Floppy drives     | Two 360KB, 720KB, 1.2MB, or 1.44MB     |
   | supported:        | drives                                 |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/c/S-T/20458-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                   Function                    |  Location  |
   |-----------------------------------------------+------------|
   | 34-pin control cable connector - hard drive   |     J2     |
   |-----------------------------------------------+------------|
   | 20-pin data cable connector - drive 0         |     J3     |
   |-----------------------------------------------+------------|
   | 20-pin data cable connector - drive 1         |     J4     |
   |-----------------------------------------------+------------|
   | 34-pin control cable connector - floppy drive |     J7     |
   |-----------------------------------------------+------------|
   | 2-pin connector - drive active LED            |    J12     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  DRIVE TYPE CONFIGURATION                  |
   |------------------------------------------------------------|
   | Cylinders | Heads  |   W1    |   W2    |   W3    |   W4    |
   |-----------+--------+---------+---------+---------+---------|
   |   ESDI    |  ESDI  | closed  | closed  | closed  | closed  |
   |-----------+--------+---------+---------+---------+---------|
   |    918    |   15   |  open   | closed  | closed  | closed  |
   |-----------+--------+---------+---------+---------+---------|
   |    987    |   7    | closed  |  open   | closed  | closed  |
   |-----------+--------+---------+---------+---------+---------|
   |    697    |   5    |  open   |  open   | closed  | closed  |
   |-----------+--------+---------+---------+---------+---------|
   |    306    |   4    | closed  | closed  |  open   | closed  |
   |-----------+--------+---------+---------+---------+---------|
   |    977    |   5    |  open   | closed  |  open   | closed  |
   |-----------+--------+---------+---------+---------+---------|
   |    733    |   5    | closed  |  open   |  open   | closed  |
   |-----------+--------+---------+---------+---------+---------|
   |    640    |   6    |  open   |  open   |  open   | closed  |
   |-----------+--------+---------+---------+---------+---------|
   |    640    |   4    | closed  | closed  | closed  |  open   |
   |-----------+--------+---------+---------+---------+---------|
   |    512    |   8    |  open   | closed  | closed  |  open   |
   |-----------+--------+---------+---------+---------+---------|
   |    612    |   2    | closed  |  open   | closed  |  open   |
   |-----------+--------+---------+---------+---------+---------|
   |    612    |   7    |  open   |  open   | closed  |  open   |
   |-----------+--------+---------+---------+---------+---------|
   |    615    |   4    | closed  | closed  |  open   |  open   |
   |-----------+--------+---------+---------+---------+---------|
   |    612    |   4    |  open   | closed  |  open   |  open   |
   |-----------+--------+---------+---------+---------+---------|
   |    306    |   6    | closed  |  open   |  open   |  open   |
   |-----------+--------+---------+---------+---------+---------|
   |    306    |   4    |  open   |  open   |  open   |  open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  HARD DRIVE PORT ADDRESS                   |
   |------------------------------------------------------------|
   |    Address     |      W5      |      W6      |     W22     |
   |----------------+--------------+--------------+-------------|
   |>> |    320h    |     open     |     open     |   closed    |
   |---+------------+--------------+--------------+-------------|
   |   |    324h    |    closed    |     open     |   closed    |
   |---+------------+--------------+--------------+-------------|
   |   |    328h    |     open     |    closed    |   closed    |
   |---+------------+--------------+--------------+-------------|
   |   |    32Ch    |    closed    |    closed    |   closed    |
   |---+------------+--------------+--------------+-------------|
   |   |    1A0h    |     open     |     open     |    open     |
   |---+------------+--------------+--------------+-------------|
   |   |    1A4h    |    closed    |     open     |    open     |
   |---+------------+--------------+--------------+-------------|
   |   |    1A8h    |     open     |    closed    |    open     |
   |---+------------+--------------+--------------+-------------|
   |   |    1ACh    |    closed    |    closed    |    open     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Location | Setting |
   |---------------------------------------+----------+---------|
   |>> | Floppy drive port address is      |    W7    | closed  |
   |   | 3F0-3F7h                          |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Floppy drive port address is      |    W7    |  open   |
   |   | 370-377h                          |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 0 sector type is soft       |   W10    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 0 sector type is hard       |   W10    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 0 set for ST506 drive       |   W11    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 0 set for ESDI drive        |   W11    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 0 set for fixed media drive |   W12    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 0 set for removable media   |   W12    | closed  |
   |   | drive                             |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 1 sector type is soft       |   W13    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 1 sector type is hard       |   W13    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 1 set for ST506 drive       |   W14    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 1 set for ESDI drive        |   W14    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 1 set for fixed media drive |   W15    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 1 set for removable media   |   W15    | closed  |
   |   | drive                             |          |         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      BYTES PER SECTOR                      |
   |------------------------------------------------------------|
   |  Bytes per sector/sectors per track  |    W8    |    W9    |
   |--------------------------------------+----------+----------|
   |>>             |        512/17        |   open   |   open   |
   |---------------+----------------------+----------+----------|
   |               |        512/18        |  closed  |   open   |
   |---------------+----------------------+----------+----------|
   |               |        1024/9        |   open   |  closed  |
   |---------------+----------------------+----------+----------|
   |               |        1056/9        |  closed  |  closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   | Jumpers W21, W23, W24, W25 are factory configured - do not |
   |                           alter.                           |
   +------------------------------------------------------------+