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
| 
 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 3F0-3F7h  | 
 W2  | 
 open  | 
| 
 Floppy drive port address is 370-377h  | 
 W2  | 
 closed  | |
| » | 
 Hard drive port address is 1F0-1F7h  | 
 W3  | 
 open  | 
| 
 Hard drive port address is 170-177h  | 
 W3  | 
 closed  | |
| » | 
 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 Strobe Offset disabled  | 
 W18  | 
 open  | 
| 
 Track Offset Cmd. and Data Strobe Offset enabled  | 
 W18  | 
 closed  | |
| » | 
 Single speed floppy drive supported  | 
 W19  | 
 open  | 
| 
 Dual speed floppy drive Supported  | 
 W19  | 
 closed  | |
| » | 
 Floppy connector (CN1) polarity active high  | 
 W20  | 
 pins 1 & 2 closed  | 
| 
 Floppy connector (CN1) polarity active low  | 
 W20  | 
 pins 2 & 3 closed  | |
| » | 
 Floppy connector (CN1) polarity active high  | 
 W21  | 
 pins 1 & 2 closed  | 
| 
 Floppy connector (CN1) polarity active low  | 
 W21  | 
 pins 2 & 3 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  | |