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# WESTERN DIGITAL CORPORATION
WD1003A-RA2
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 16-bit, ISA |
|-------------------+----------------------------------------|
| Size: | Full-length, full-height card |
|-------------------+----------------------------------------|
| Hard drive | Two MFM ST506/412 drives |
| supported: | |
|-------------------+----------------------------------------|
| Floppy drives | Two 360KB, 720KB, 1.2MB, or 1.44MB |
| supported: | drives |
|-------------------+----------------------------------------|
| Maximum | 16 heads and 2048 cylinders |
| heads/cyl.: | |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-------------------------------------------+----------------|
| 4-pin connector-drive active LED | CN1 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 1 | CN2 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 0 | CN3 |
|-------------------------------------------+----------------|
| 34-pin control cable connector-hard drive | CN4 |
|-------------------------------------------+----------------|
| 34-pin data cable connector-floppy drive | CN5 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|----------------------------------+------------+------------|
| » | WD11C00C-22 in socket U16 | JP1 | pins 1 & 2 |
| | | | closed |
|---+------------------------------+------------+------------|
| | WD11C00-22 in socket U8 & | JP1 | pins 2 & 3 |
| | JP5 pins 1 & 2 closed | | closed |
|---+------------------------------+------------+------------|
| » | Logical translation for | JP2 | open |
| | drive 0 disabled | | |
|---+------------------------------+------------+------------|
| | Logical translation for | JP2 | closed |
| | drive 0 enabled | | |
|---+------------------------------+------------+------------|
| » | Logical translation for | JP2A | open |
| | drive 1 disabled | | |
|---+------------------------------+------------+------------|
| | Logical translation for | JP2A | closed |
| | drive 1 enabled | | |
|---+------------------------------+------------+------------|
| » | Not used | JP2B | open |
|---+------------------------------+------------+------------|
| » | Factory configured - do not | JP3 & JP3A | closed |
| | alter | | |
|---+------------------------------+------------+------------|
| » | Hard drive port address is | JP4 | pins 2 & 3 |
| | 1F0-1F7h | | closed |
|---+------------------------------+------------+------------|
| | Hard drive port address is | JP4 | pins 1 & 2 |
| | 170-177h | | closed |
|---+------------------------------+------------+------------|
| » | Floppy drive port address is | JP4A | pins 2 & 3 |
| | 3F0-3F7h | | closed |
|---+------------------------------+------------+------------|
| | Floppy drive port address is | JP4A | pins 1 & 2 |
| | 370-377 | | closed |
|---+------------------------------+------------+------------|
| » | 8 head hard drive or RWC | JP5 | pins 1 & 2 |
| | (hard-wired) | | closed |
|---+------------------------------+------------+------------|
| | 16 head hard drive supported | JP5 | pins 2 & 3 |
| | | | open |
|---+------------------------------+------------+------------|
| » | Supports 300 or 360 RPM | JP7 | pins 2 & 3 |
| | floppy disk drives | | closed |
|---+------------------------------+------------+------------|
| | Supports dual speed spindle | JP7 | pins 1 & 2 |
| | floppy drives | | closed |
+------------------------------------------------------------+