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# UNIDENTIFIED
EXPERT TOP HFDC
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 16-bit ISA |
|-------------------+----------------------------------------|
| Size: | Three/quarter-length, full-height card |
|-------------------+----------------------------------------|
| Hard drive | Two MFM ST506/412 drives |
| supported: | |
|-------------------+----------------------------------------|
| Floppy drives | Two 360KB, 720KB, 1.2MB, 1.44MB drives |
| supported: | |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|---------------------------------------------+--------------|
| 34-pin control cable connector - hard drive | J1 |
|---------------------------------------------+--------------|
| 20-pin data cable connector - drive 1 | J2 |
|---------------------------------------------+--------------|
| 20-pin data cable connector - drive 0 | J3 |
|---------------------------------------------+--------------|
| 34-pin connector - floppy drive interface | J4 |
|---------------------------------------------+--------------|
| 2-pin connector - drive active LED | J6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|------------------------------------+----------+------------|
| » | Floppy drive interface | W1 | pins 1 & 2 |
| | operates at 360 RPM | | closed |
|---+--------------------------------+----------+------------|
| | Floppy drive interface | W1 | pins 2 & 3 |
| | operates at 300 RPM | | closed |
|---+--------------------------------+----------+------------|
| » | Floppy drive is primary in | W4 | pins 2 & 3 |
| | system (3F2 - 3F7h) | | closed |
|---+--------------------------------+----------+------------|
| | Floppy drive is secondary in | W4 | pins 1 & 2 |
| | system (372 - 377h) | | closed |
|---+--------------------------------+----------+------------|
| » | ST506/412(MFM) interface is | W6 | pins 2 & 3 |
| | primary in system (1F0 - 1F7h) | | closed |
|---+--------------------------------+----------+------------|
| | ST506/412(MFM) interface is | W6 | pins 1 & 2 |
| | secondary in system (170 - | | closed |
| | 177h) | | |
+------------------------------------------------------------+