SCIENTIFIC MICRO SYSTEMS
OMTI 810, OMTI 812, OMTI 820, OMTI 822
Data bus: 16-bit, ISA
Size: Full-length, full-height card
Hard drives supported: Up to seven SCSI devices
Floppy drives supported: OMTI 81x: None
OMTI 82x: Two 360KB, 720KB, 1.2MB, 1.44MB
Maximum heads/cyl.: 16 heads and 1024 cylinders
|
CONNECTIONS | |
|
Function |
Location |
|
50-pin SCSI connector-internal |
J1 |
|
50-pin SCSI connector-external (Models 8x2 only) |
J2 |
|
34-pin control cable connector-floppy drive |
J3 |
|
4-pin connector-drive active LED |
J4 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Location |
Setting | |
| » |
SCSI parity check enabled |
W3 |
closed |
|
SCSI parity check disabled |
W3 |
open | |
| » |
Factory configured - do not alter |
W4 |
open |
| » |
Factory configured - do not alter |
W10 |
open |
| » |
AT-type floppy drives supported (Models 82x only) |
W11 |
open |
|
Non-stand. floppy drives supported (Models 82x only) |
W11 |
closed | |
|
Factory set on board 32K PROM size |
W15 |
open | |
| » |
Factory configured - do not alter |
W26 |
open |
| » |
SCSI-2 RSVD lines grounded (terminators installed) |
W32 |
closed |
|
SCSI-2 RSVD lines not grounded (terminators removed) |
W32 |
open | |
| » |
Floppy drive port address is 3F0-3F7 (Models 82x only) |
W33 |
pins 1 & 2 closed |
|
Floppy drive port address is 370-377 (Models 820x only) |
W33 |
pins 2 & 3 closed | |
| » |
Floppy drive enabled |
W35 |
closed |
|
Floppy drive disabled |
W35 |
open | |
| » |
Power-ground and chassis-ground separate |
W44 |
open |
|
Power-ground and chassis-ground connected |
W44 |
closed | |
|
SCSI ADDRESS | ||||
|
Address |
W0 |
W1 |
W2 | |
|
0 |
closed |
closed |
closed | |
|
1 |
open |
closed |
closed | |
|
2 |
closed |
open |
closed | |
|
3 |
open |
open |
closed | |
|
4 |
closed |
closed |
open | |
|
5 |
open |
closed |
open | |
|
6 |
closed |
open |
open | |
| » |
7 |
open |
open |
open |
|
BIOS ADDRESS | ||||
|
Select |
W15 |
W16 |
W17 | |
|
C0000h |
closed |
closed |
closed | |
|
C8000h |
open |
closed |
closed | |
|
D0000h |
closed |
open |
closed | |
| » |
D8000h |
open |
open |
closed |
|
E0000h |
closed |
closed |
open | |
|
E8000 |
open |
closed |
open | |
|
F0000h |
closed |
open |
open | |
|
F8000h |
open |
open |
open | |
|
I/O PORT ADDRESS | ||||||
|
Address |
W5 |
W6 |
W7 |
W8 |
W9 | |
|
100 |
closed |
closed |
closed |
open |
closed | |
|
120 |
open |
closed |
closed |
open |
closed | |
|
140 |
closed |
open |
closed |
open |
closed | |
|
160 |
open |
open |
closed |
open |
closed | |
|
180 |
closed |
closed |
open |
open |
closed | |
|
1A0 |
open |
closed |
open |
open |
closed | |
|
1C0 |
closed |
open |
open |
open |
closed | |
|
1E0 |
open |
open |
open |
open |
closed | |
|
200 |
closed |
closed |
closed |
closed |
open | |
|
220 |
open |
closed |
closed |
closed |
open | |
|
240 |
closed |
open |
closed |
closed |
open | |
|
260 |
open |
open |
closed |
closed |
open | |
|
280 |
closed |
closed |
open |
closed |
open | |
|
2A0 |
open |
closed |
open |
closed |
open | |
|
2C0 |
closed |
open |
open |
closed |
open | |
|
2E0 |
open |
open |
open |
closed |
open | |
|
300 |
closed |
closed |
closed |
open |
open | |
|
320 |
open |
closed |
closed |
open |
open | |
| » |
340 |
closed |
open |
closed |
open |
open |
|
360 |
open |
open |
closed |
open |
open | |
|
380 |
closed |
closed |
open |
open |
open | |
|
3A0 |
open |
closed |
open |
open |
open | |
|
3C0 |
closed |
open |
open |
open |
open | |
|
3E0 |
open |
open |
open |
open |
open | |
|
DMA CHANNEL | |||||||
|
Channel |
W20 |
W21 |
W22 |
W23 |
W24 |
W25 | |
|
DRQ3 |
closed |
open |
open |
open |
closed |
closed | |
| » |
DRQ5 |
open |
closed |
open |
open |
closed |
open |
|
DRQ6 |
open |
open |
closed |
open |
open |
closed | |
|
DRQ7 |
open |
open |
open |
closed |
open |
open | |
|
INTERRUPT REQUEST | |||||
|
IRQ |
W27 |
W28 |
W29 |
W30 | |
|
Disabled |
N/A |
N/A |
N/A |
closed | |
|
IRQ3 |
closed |
closed |
closed |
open | |
|
IRQ4 |
open |
closed |
closed |
open | |
|
IRQ5 |
closed |
open |
closed |
open | |
|
IRQ6 |
open |
closed |
closed |
open | |
|
IRQ7 |
closed |
closed |
open |
open | |
| » |
IRQ12 |
open |
closed |
open |
open |
|
IRQ14 |
closed |
open |
open |
open | |
|
IRQ15 |
open |
open |
open |
open | |
|
MISCELLANEOUS TECHNICAL NOTES |
|
W12-14, W31, W34, W36, W37, W43, W45 are factory configurable or Not used and are hard wired on some board revisions. The default for these jumpers is "open", with a jumper stored on pin 2. |
