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# SCIENTIFIC MICRO SYSTEMS, INC.
OMTI 3120A, OMTI 3127A
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 50-pin SCSI interface |
|---------------+--------------------------------------------|
| Size: | 4" x 5.75" |
|---------------+--------------------------------------------|
| Hard drive | Up to two ST506/412 MFM drives in 3120A, |
| supported: | and up to two |
| | |
| | ST506/412 RLL 2,7 drives in 3127A |
|---------------+--------------------------------------------|
| Floppy drives | None |
| supported: | |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|------------------------------------------+-----------------|
| 50-pin SCSI interface | J1 |
|------------------------------------------+-----------------|
| 34-pin MFM disk control connector | J2 |
|------------------------------------------+-----------------|
| 20-pin data cable connector | J3 |
|------------------------------------------+-----------------|
| 20-pin data cable connector | J4 |
|------------------------------------------+-----------------|
| DC power connector | J10 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | W12/1-3 | N/A |
| | alter | | |
|---+-------------------------------+--------------+---------|
| » | Factory configured - do not | W13/1-3 | N/A |
| | alter | | |
|---+-------------------------------+--------------+---------|
| » | Factory configured - do not | W14/1-2 | N/A |
| | alter | | |
|---+-------------------------------+--------------+---------|
| » | TRMPWR supplied by board | W15/pins 1 & | closed |
| | (3127A) | 2 | |
|---+-------------------------------+--------------+---------|
| » | TRMPWR supplied by SCSI bus | W15/pins 2 & | closed |
| | (3127A) | 3 | |
|---+-------------------------------+--------------+---------|
| » | Factory configured - do not | W17/1-3 | N/A |
| | alter | | |
|------------------------------------------------------------|
| Note: Location of W15 pin 1 is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------------------------------------------------|
| Note: Location of W6 is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+