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 | |