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# AUVA COMPUTER, INC.
HFDC-II
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 16-bit ISA |
|-------------------+----------------------------------------|
| Size: | Three-quarter length, full-height card |
|-------------------+----------------------------------------|
| Hard drive | Two MFM ST-506/412 drives |
| supported: | |
|-------------------+----------------------------------------|
| Floppy drives | Two 360KB, 720KB, 1.2MB, or 1.44MB |
| supported: | drives |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-----------------------------------------------+------------|
| 4-pin connector - drive active LED | J1 |
|-----------------------------------------------+------------|
| 20-pin data cable connector - drive 1 | J2 |
|-----------------------------------------------+------------|
| 20-pin data cable connector - drive 0 | J3 |
|-----------------------------------------------+------------|
| 34-pin control cable connector - hard drive | J4 |
|-----------------------------------------------+------------|
| 34-pin control cable connector - floppy drive | J5 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|-------------------------------------+-----------+----------|
| | LED always "on" when system on | W1/1 | open |
|---+---------------------------------+-----------+----------|
| | LED "on" only when drive is | W1/1 | closed |
| | being accessed | | |
|---+---------------------------------+-----------+----------|
| ยป | Four byte ECC enabled | W1/2 | open |
|---+---------------------------------+-----------+----------|
| | Reserved - do not use | W1/2 | closed |
|---+---------------------------------+-----------+----------|
| | Cache enabled | W1/3 | open |
|---+---------------------------------+-----------+----------|
| | Cache disabled | W1/3 | closed |
|---+---------------------------------+-----------+----------|
| | Interleave ratio is 1:1 | W1/4 | open |
|---+---------------------------------+-----------+----------|
| | Maximum interleave ratio is 1:3 | W1/4 | closed |
|---+---------------------------------+-----------+----------|
| | Floppy drive primary address is | W2 | open |
| | 3F2-3F7h | | |
|---+---------------------------------+-----------+----------|
| | Floppy drive secondary address | W2 | closed |
| | is 372-377h | | |
|------------------------------------------------------------|
| Note: Close W1/4 when using disks formatted under the |
| WD1003-WAH controller. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS CONTINUED |
|------------------------------------------------------------|
| Function | Location | Setting |
|---------------------------------------+----------+---------|
| Hard drive primary address is | W3 | open |
| 1F0-1F7h | | |
|---------------------------------------+----------+---------|
| Hard drive secondary address is | W3 | closed |
| 170-177h | | |
|---------------------------------------+----------+---------|
| Floppy drive single speed enabled | W4 | open |
|---------------------------------------+----------+---------|
| Floppy drive dual speed enabled | W4 | closed |
+------------------------------------------------------------+