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

   OMTI 8620, OMTI 8627

   Data bus:           16-bit, ISA                                
   Size:               Full-length, full-height card              
   Hard drives         OMTI 8620:Two MFM ST506/ST412 drives or    
   supported:          ESDI drives                                
                                                                  
                       OMTI 8627:Two RLL ST506/ST412 or ESDI      
                       drives                                     
   Floppy drives       Two 360KB, 720KB, 1.2MB, 1.44MB drives     
   supported:          
   Sector interleave:  1:1                                        
   Maximum heads/cyl.: 16 heads and 2048 cylinders                

<gopher://bitreich.org/I/th99/c/S-T/20188-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                  Function                   |   Location   |
   |---------------------------------------------+--------------|
   | 34-pin control cable connecter-floppy drive |      J1      |
   |---------------------------------------------+--------------|
   | 34-pin control cable connecter-hard drive   |      J2      |
   |---------------------------------------------+--------------|
   | 20-pin data cable connecter-drive 0         |      J3      |
   |---------------------------------------------+--------------|
   | 20-pin data cable connecter-drive 1         |      J4      |
   |---------------------------------------------+--------------|
   | 4-pin connecter-drive active LED            |      J5      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Location | Setting |
   |---------------------------------------+----------+---------|
   |>> | Drive 1 set for fixed media drive |    W4    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 1 set for removable media   |    W4    | closed  |
   |   | drive                             |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 1 set for ST506 drive       |    W5    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 1 set for ESDI drive        |    W5    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 1 soft sectored             |    W6    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 1 hard sectored             |    W6    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 0 set for fixed media drive |    W7    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 0 set for removable media   |    W7    | closed  |
   |   | drive                             |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 0 set for ST506 drive       |    W8    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 0 set for ESDI drive        |    W8    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Drive 0 soft sectored             |    W9    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | Drive 0 hard sectored             |    W9    | closed  |
   |---+-----------------------------------+----------+---------|
   |   | If the drive on CN3 is a ESDI     |   W12    |  open   |
   |   | drive this trace must be cut      |          |         |
   |---+-----------------------------------+----------+---------|
   |   | If the drive on CN4 is a ESDI     |   W13    |  open   |
   |   | drive this trace must be cut      |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Floppy drive port address is      |   W14    |  open   |
   |   | 3F0-3F7                           |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Floppy drive port address is      |   W14    | closed  |
   |   | 370-377                           |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | BIOS base address is C8000h       |   W15    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | BIOS base address is CA000h       |   W15    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | BIOS enabled                      |   W16    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | BIOS disabled                     |   W16    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | Factory configured - do not alter |   W20    |   N/A   |
   |---+-----------------------------------+----------+---------|
   |>> | I/O speed set to high performance |   W21    |  open   |
   |   | string mode                       |          |         |
   |---+-----------------------------------+----------+---------|
   |   | I/O speed set to loop             |   W21    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | If BIOS is #1002661, then drive 0 |   W22    |  open   |
   |   | parameters are set to 4  hds. and |          |         |
   |   | 612 cyl. If BIOS is #1002662,     |          |         |
   |   | then drive 0  parameter are set   |          |         |
   |   | to 4 hds. and 615 cyl.            |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Factory configured - do not alter |   W22    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | If BIOS is #1002661, then drive 1 |   W23    |  open   |
   |   | parameters are set to 4  hds. and |          |         |
   |   | 612 cyl.If BIOS is #1002662, then |          |         |
   |   | drive 1  parameter are set to 4   |          |         |
   |   | hds. and 615 cyl.                 |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Factory configured - do not alter |   W23    | closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    SECTOR CONFIGURATION                    |
   |------------------------------------------------------------|
   |  Jumper   |  Jumper   | BPS (ST506  | SPT- 8620 |   SPT-   |
   |    W10    |    W11    |    only)    |           |   8627   |
   |-----------+-----------+-------------+-----------+----------|
   |   open    |   open    |     512     |    17     |    26    |
   |-----------+-----------+-------------+-----------+----------|
   |   open    |  closed   |     512     |    17     |    26    |
   |-----------+-----------+-------------+-----------+----------|
   |  closed   |   open    |    1024     |    18     |    26    |
   |-----------+-----------+-------------+-----------+----------|
   |  closed   |  closed   |    1056     |     9     |    13    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      I/O PORT ADDRESS                      |
   |------------------------------------------------------------|
   |  Address   |  Jumper W17   |  Jumper W18   |  Jumper W19   |
   |------------+---------------+---------------+---------------|
   |    320h    |     open      |     open      |     open      |
   |------------+---------------+---------------+---------------|
   |    324h    |     open      |     open      |    closed     |
   |------------+---------------+---------------+---------------|
   |    328h    |     open      |    closed     |     open      |
   |------------+---------------+---------------+---------------|
   |    32Ch    |     open      |    closed     |    closed     |
   |------------+---------------+---------------+---------------|
   |    1A0h    |    closed     |     open      |     open      |
   |------------+---------------+---------------+---------------|
   |    1A4h    |    closed     |     open      |    closed     |
   |------------+---------------+---------------+---------------|
   |    1A8h    |    closed     |    closed     |     open      |
   |------------+---------------+---------------+---------------|
   |    1ACh    |    closed     |    closed     |    closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            DRIVE TYPE CONFIGURATION - #1002579             |
   |------------------------------------------------------------|
   | DRIVE 0  | DRIVE 2  |          |                           |
   |----------+----------+----------+---------------------------|
   |   W20    |   W21    |   W22    |   W23    |  Cyl.  | Hds.  |
   |----------+----------+----------+----------+--------+-------|
   |  closed  |  closed  |  closed  |  closed  |  ESDI  | ESDI  |
   |----------+----------+----------+----------+--------+-------|
   |   open   |  closed  |   open   |  closed  |  987   |   7   |
   |----------+----------+----------+----------+--------+-------|
   |  closed  |   open   |  closed  |   open   |  918   |  15   |
   |----------+----------+----------+----------+--------+-------|
   |   open   |   open   |   open   |   open   |  612   |   4   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            DRIVE TYPE CONFIGURATION - #1002578             |
   |------------------------------------------------------------|
   | DRIVE 0  | DRIVE 2  |          |                           |
   |----------+----------+----------+---------------------------|
   |   W20    |   W21    |   W22    |   W23    |  Cyl.  | Hds.  |
   |----------+----------+----------+----------+--------+-------|
   |  closed  |  closed  |  closed  |  closed  |  ESDI  | ESDI  |
   |----------+----------+----------+----------+--------+-------|
   |   open   |  closed  |   open   |  closed  |  820   |   6   |
   |----------+----------+----------+----------+--------+-------|
   |  closed  |   open   |  closed  |   open   |  1024  |   9   |
   |----------+----------+----------+----------+--------+-------|
   |   open   |   open   |   open   |   open   |  615   |   4   |
   +------------------------------------------------------------+