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# SCIENTIFIC MICRO SYSTEMS
OMTI 8640
Data bus: 16-bit, ISA
Size: Full-length, full-height card
Hard drives supported: Two ESDI RLL drives
Floppy drives supported: Four 360KB, 720KB, 1.2MB,or 1.44MB
Sector interleave: 1:1
Maximum heads/cyl.: 16 heads and 2048 cylinders
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|------------------------------------------------+-----------|
| 34-pin data cable connector-floppy drive 1 & 2 | J1 |
|------------------------------------------------+-----------|
| 34-pin data cable connector-floppy drive 3 & 4 | J2 |
|------------------------------------------------+-----------|
| 20-pin data cable connector-drive 0 | J3 |
|------------------------------------------------+-----------|
| 20-pin data cable connector-drive 1 | J4 |
|------------------------------------------------+-----------|
| 34-pin control cable connector-hard drive | J5 |
|------------------------------------------------+-----------|
| 4-pin connector-drive active LED | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|------------------------------------+----------+------------|
| » | Floppy drive port address is | W2 | open |
| | 3F0-3F7h | | |
|---+--------------------------------+----------+------------|
| | Floppy drive port address is | W2 | closed |
| | 370-377h | | |
|---+--------------------------------+----------+------------|
| » | Hard drive port address is | W3 | open |
| | 1F0-1F7h | | |
|---+--------------------------------+----------+------------|
| | Hard drive port address is | W3 | closed |
| | 170-177h | | |
|---+--------------------------------+----------+------------|
| » | Floppy enabled | W5 | open |
|---+--------------------------------+----------+------------|
| | Floppy drive disabled | W5 | closed |
|---+--------------------------------+----------+------------|
| » | SPT-read from drive | W16 | open |
|---+--------------------------------+----------+------------|
| | SPT-calculate and set | W16 | closed |
|---+--------------------------------+----------+------------|
| » | Cache disabled | W17 | open |
|---+--------------------------------+----------+------------|
| | Cache enabled | W17 | closed |
|---+--------------------------------+----------+------------|
| » | Track Offset Cmd. and Data | W18 | open |
| | Strobe Offset disabled | | |
|---+--------------------------------+----------+------------|
| | Track Offset Cmd. and Data | W18 | closed |
| | Strobe Offset enabled | | |
|---+--------------------------------+----------+------------|
| » | Single speed floppy drive | W19 | open |
| | supported | | |
|---+--------------------------------+----------+------------|
| | Dual speed floppy drive | W19 | closed |
| | Supported | | |
|---+--------------------------------+----------+------------|
| » | Floppy connector (CN1) | W20 | pins 1 & 2 |
| | polarity active high | | closed |
|---+--------------------------------+----------+------------|
| | Floppy connector (CN1) | W20 | pins 2 & 3 |
| | polarity active low | | closed |
|---+--------------------------------+----------+------------|
| » | Floppy connector (CN1) | W21 | pins 1 & 2 |
| | polarity active high | | closed |
|---+--------------------------------+----------+------------|
| | Floppy connector (CN1) | W21 | pins 2 & 3 |
| | polarity active low | | closed |
|---+--------------------------------+----------+------------|
| » | BIOS enabled | W25 | closed |
|---+--------------------------------+----------+------------|
| | BIOS disabled | W25 | open |
|---+--------------------------------+----------+------------|
| » | Chassis not grounded | W28 | open |
|---+--------------------------------+----------+------------|
| | Chassis grounded | W28 | closed |
|------------------------------------------------------------|
| Note:W22, & W11-15 are not documented |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ADDRESS |
|------------------------------------------------------------|
| Address | Jumper W23 | Jumper W24 |
|--------------------+-------------------+-------------------|
| » | C8000h | closed | closed |
|---+----------------+-------------------+-------------------|
| | CA000h | closed | open |
|---+----------------+-------------------+-------------------|
| | CC000h | open | closed |
|---+----------------+-------------------+-------------------|
| | CE000h | open | open |
+------------------------------------------------------------+