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# UNIDENTIFIED
H/FDC ADAPTER
Card Type Hard drive controller
Hard Drives supported Two IDE (AT) drives
Floppy drives supported Two 360KB, 720KB, 1.2MB, 1.44MB
Data Bus 16-bit ISA
Card Size Half-length, full-height
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------+-------+-------------------+-------|
| 34-pin cable connector | CN1 | 2-pin connector - | J1 |
| - floppy drive | | drive active LED | |
|------------------------+-------+-------------------+-------|
| 40-pin IDE(AT) | CN2 | | |
| connector | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| » | One hard drive in system | J2 | Open |
|---+-----------------------------------+-------+------------|
| | Two hard drives in system | J2 | Closed |
|---+-----------------------------------+-------+------------|
| » | IOCHRDY signal disabled | J3 | Open |
|---+-----------------------------------+-------+------------|
| | IOCHRDY signal enabled | J3 | Closed |
|---+-----------------------------------+-------+------------|
| » | Host system acknowledges | J4 | Pins 1 & 2 |
| | Interrupt status register | | closed |
|---+-----------------------------------+-------+------------|
| | Host system ignores Interrupt | J4 | Pine 2 & 3 |
| | status register | | closed |
|---+-----------------------------------+-------+------------|
| » | 300KPS for DP8473 enabled | J5 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | 250KPS for DP8473 enabled | J5 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Proper precompensation value for | J6 | Pins 2 & 3 |
| | DP8473 floppy drive enabled | | closed |
|---+-----------------------------------+-------+------------|
| | Precompensation control for | J6 | Pins 1 & 2 |
| | DP8473 floppy drive disabled | | closed |
|---+-----------------------------------+-------+------------|
| » | Floppy drive interface enabled | J7 | Open |
|---+-----------------------------------+-------+------------|
| | Floppy drive interface disabled | J7 | Closed |
|---+-----------------------------------+-------+------------|
| » | IDE(AT) interface enabled | J8 | Open |
|---+-----------------------------------+-------+------------|
| | IDE(AT) interface disabled | J8 | Closed |
|---+-----------------------------------+-------+------------|
| » | IDE primary address enabled | J9 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | IDE secondary address enabled | J9 | Pins 1 & 2 |
| | | | closed |
+------------------------------------------------------------+