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# SCIENTIFIC MICROSYSTEMS, INC.
OMTI 3520, OMTI 3527
Maximum On-board 8KB
Memory
Data Bus External
Card Size 3.5 in. form factor
Hard Drives Two ST-506/412(MFM) drives on OMTI 3520
supported
Two ST-506/412(2,7 RLL) drives on OMTI
3527
Floppy drives None
supported
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location | Function | Location |
|------------------+----------+-------------------+----------|
| 50-pin SCSI | J1 | 20-pin data cable | J3 |
| connector - | | connector - drive | |
| external | | 1 | |
|------------------+----------+-------------------+----------|
| 34-pin cable | J2 | 20-pin data cable | J4 |
| connector - hard | | connector - drive | |
| drive | | 2 | |
|------------------------------------------------------------|
| Note: J1 is the interface between the host computer and |
| the OMTI 3520/3527. See Miscellaneous |
| |
| Technical Note. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-------------------------------------+-------+--------------|
| » | SCSI parity check enabled | W4 | Closed |
|---+---------------------------------+-------+--------------|
| | SCSI parity check disabled | W4 | Open |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W5 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W6 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W7 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W8 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W9 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W10 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W11 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W12 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W13 | Unidentified |
| | alter | | |
|---+---------------------------------+-------+--------------|
| » | Termination power from board | W14 | Pins 1 & 2 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| | Termination power from SCSI bus | W14 | Pins 2 & 3 |
| | | | closed |
|---+---------------------------------+-------+--------------|
| » | Factory configured - do not | W15 | Unidentified |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SCSI ID SELECTION |
|------------------------------------------------------------|
| Setting | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note: The OMTI 3520 and OMTI 3527 controllers are |
| connected to the host system via the SCSI bus |
| |
| (connector J1). Up to seven SCSI devices may be connected |
| to this bus and an OMTI |
| |
| 3520/3527 controller is considered to be one of these |
| devices. Multiple controllers may be |
| |
| attached, with each controller assigned a unique SCSI ID |
| using jumpers W1, W2 and W3. |
+------------------------------------------------------------+