SCIENTIFIC MICRO SYSTEMS, INC.
OMTI 3120A, OMTI 3127A
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| |
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Data bus: |
50-pin SCSI interface |
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Size: |
4" x 5.75" |
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Hard drive supported: |
Up to two ST506/412 MFM drives in 3120A, and up to two ST506/412 RLL 2,7 drives in 3127A |
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Floppy drives supported: |
None |
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CONNECTIONS | |
|
Function |
Location |
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50-pin SCSI interface |
J1 |
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34-pin MFM disk control connector |
J2 |
|
20-pin data cable connector |
J3 |
|
20-pin data cable connector |
J4 |
|
DC power connector |
J10 |
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SCSI ADDRESS | ||||
|
SCSI ID |
W1 |
W2 |
W3 | |
|
0 |
open |
open |
open | |
|
1 |
closed |
open |
open | |
|
2 |
open |
closed |
open | |
|
3 |
closed |
closed |
open | |
|
4 |
open |
open |
closed | |
|
5 |
closed |
open |
closed | |
|
6 |
open |
closed |
closed | |
|
7 |
closed |
closed |
closed | |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Location |
Setting | |
|
SCSI parity enabled |
W4 |
closed | |
|
SCSI parity disabled |
W4 |
open | |
|
Factory configured - do not alter |
W12/1-3 |
N/A | |
|
Factory configured - do not alter |
W13/1-3 |
N/A | |
|
Factory configured - do not alter |
W14/1-2 |
N/A | |
|
TRMPWR supplied by board (3127A) |
W15/pins 1 & 2 |
closed | |
|
TRMPWR supplied by SCSI bus (3127A) |
W15/pins 2 & 3 |
closed | |
|
Factory configured - do not alter |
W17/1-3 |
N/A | |
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Note: Location of W15 pin 1 is unidentified. | |||
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SECTOR CONFIGURATION | ||||
|
Bytes/Sector |
Sector/Track |
W5 |
W6 | |
|
512 |
17 |
open |
closed | |
|
256 |
32 |
closed |
open | |
|
512 (3120A) |
18 |
open |
open | |
|
532 (3127A) |
17 |
open |
open | |
|
1024 |
9 |
closed |
closed | |
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Note: Location of W6 is unidentified. | ||||
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TERMINATION POWER - 3120A | ||||
|
Function |
W11/1 |
W11/2 |
W11/3 | |
|
TRMPWR supplied by board |
open |
closed |
closed | |
|
TRMPWR supplied by SCSI bus |
closed |
closed |
open | |