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# WESTERN DIGITAL CORPORATION
WD1003S-RAH
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+------------------------------------------------------------+
Data bus: 16-bit, ISA
Size: Half-length, full-height card
Hard drives supported: Two ST506/412 RLL drives
Floppy drives supported: Two 360KB, 720KB, 1.2MB, or 1.44MB
drives
(IMG) IMG 1
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| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-------------------------------------------------+----------|
| 34-pin control cable connector-hard drives | CN1 |
|-------------------------------------------------+----------|
| 20-pin data cable connector-Drive 0 | CN2 |
|-------------------------------------------------+----------|
| 20-pin data cable connector-Drive 1 | CN3 |
|-------------------------------------------------+----------|
| 34-pin data cable connector-secondary hard | CN5 |
| drive (See JP7 settings) | |
|-------------------------------------------------+----------|
| 4-pin connector-drive active LED | CN6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|------------------------------------+----------+------------|
| » | Auto deselect enabled (PC/AT) | JP1 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+----------+------------|
| | Auto deselect disabled | JP1 | open |
| | (Compaq) | | |
|---+--------------------------------+----------+------------|
| » | Hard drive port address is | JP2 | open |
| | 1F0-1F7h & 3F0-3F7h | | |
|---+--------------------------------+----------+------------|
| | Hard drive port address is | JP2 | closed |
| | 170-177h & 370-377h | | |
|---+--------------------------------+----------+------------|
| » | Drive 0 translation disabled | JP4 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+----------+------------|
| | Drive 0 translation enabled* | JP4 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+----------+------------|
| » | Write Gate and drive select | JP5 | pins 2 & 3 |
| | lines are enabled only | | closed |
| | | | |
| | when drive is accessed | | |
|---+--------------------------------+----------+------------|
| | Write Gate and drive select | JP5 | pins 1 & 2 |
| | lines are disabled during | | closed |
| | power-up and when +5V is | | |
| | <+4.15V | | |
|---+--------------------------------+----------+------------|
| » | Drive 1 translation disabled | JP6 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+----------+------------|
| | Drive 1 translation enabled* | JP6 | pins 2 & 3 |
| | | | closed |
|---+--------------------------------+----------+------------|
| » | Input tied high | JP8 | pins 1 & 2 |
| | | | closed |
|---+--------------------------------+----------+------------|
| | Seek to LZ (663) on seek > | JP8 | pins 2 & 3 |
| | than 615. Step rate 0 | | closed |
| | | | |
| | (11 m m | | |
|------------------------------------------------------------|
| Note: Translates 4 x 615 x 26 to 6 x 615 x 17 |
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| DRIVE ATTACHMENT CONFIGURATION |
|------------------------------------------------------------|
| Function | JP7 |
|-----------------------------------+------------------------|
| Both drives daisy-chained from | |
| CN1, or Drive 0 is attached to | |
| CN1 and drive 1 is attached to | pins 1 & 2 and 2 & 3 |
| CN5 | closed (vertically) |
|-----------------------------------+------------------------|
| Drive 0 attached to CN5, Drive 1 | pins 1 & 3 and 2 & 4 |
| attached to CN1 | closed (horizontally) |
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