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# SCIENTIFIC MICRO SYSTEMS
OMTI 8147
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 16-bit, ISA |
|--------------------------+---------------------------------|
| Size: | Half-length, full-height card |
|--------------------------+---------------------------------|
| Hard drive supported: | Two RLL ST506/412 (RLL) drives |
|--------------------------+---------------------------------|
| Floppy drives supported: | NONE |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|------------------------------------------+-----------------|
| 4-pin power connector - hard disk | J2 |
|------------------------------------------+-----------------|
| 20-pin data connector - drive 0 | J3 |
|------------------------------------------+-----------------|
| 20-pin data connector - drive 1 | J4 |
|------------------------------------------+-----------------|
| 34-pin control cable connector | J5 |
|------------------------------------------+-----------------|
| 4-pin connector - drive active LED | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HARD DISK ADDRESS |
|------------------------------------------------------------|
| Setting | W1 | W2 |
|--------------------+-------------------+-------------------|
| Primary Address | closed | open |
|--------------------+-------------------+-------------------|
| Secondary Address | open | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| READ-RECOVERY SELECT |
|------------------------------------------------------------|
| Setting | W6 | W22 |
|--------------------------------------+------------+--------|
| ยป | Micro-stepping read-recovery | pins 2 & 3 | open |
| | mode - disabeld | closed | |
|---+----------------------------------+------------+--------|
| | Micro-stepping read-recovery | pins 1 & 2 | closed |
| | mode - enabled | closed | |
+------------------------------------------------------------+