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# WESTERN DIGITAL CORPORATION
WD1006-WAH (VER. 2)
Chipset Western Digital
Data Bus 16-bit ISA
Card Size Full height, full length
Hard Drives Supported Two ST506/412(MFM) devices
Floppy Drives Supported None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|----------------------+-------+---------------------+-------|
| 4-pin drive active | J1 | 20-pin data cable | J3 |
| LED | | connector - drive 1 | |
|----------------------+-------+---------------------+-------|
| 20-pin data cable | J2 | 34-pin control | J4 |
| connector - drive 2 | | cable connector - | |
| | | hard drive | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+-------+-----------|
| » | Drives up to 16 heads supported; | W1 | Pins 1 & |
| | reduced write current disabled | | 2 closed |
|---+------------------------------------+-------+-----------|
| | Drives up to 8 heads supported; | W1 | Pins 2 & |
| | reduced write current enabled | | 3 closed |
|---+------------------------------------+-------+-----------|
| » | Card uses primary I/O address | W3 | Pins 1 & |
| | | | 2 closed |
|---+------------------------------------+-------+-----------|
| | Card uses secondary I/O address | W3 | Pins 2 & |
| | | | 3 closed |
|---+------------------------------------+-------+-----------|
| » | Factory configured - do not alter | W5 | Open |
|---+------------------------------------+-------+-----------|
| » | Factory configured - do not alter | W6 | Open |
|---+------------------------------------+-------+-----------|
| » | Factory configured - do not alter | W7 | Open |
|---+------------------------------------+-------+-----------|
| » | Factory configured - do not alter | W8 | Open |
|---+------------------------------------+-------+-----------|
| » | Hard drive caching enabled | W9 | Open |
|---+------------------------------------+-------+-----------|
| | Hard drive caching disabled | W9 | Closed |
|---+------------------------------------+-------+-----------|
| » | Signal ground not connected to | W11 | Open |
| | chassis ground | | |
|---+------------------------------------+-------+-----------|
| | Signal ground connected to chassis | W11 | Closed |
| | ground | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| WAIT STATE SELECTION |
|------------------------------------------------------------|
| Setting | W2/A | W2/B | W2/C |
|---------------------------+----------+----------+----------|
| » | Disabled | Open | Open | Open |
|-----+---------------------+----------+----------+----------|
| » | 0 wait states | Closed | Open | Open |
|-----+---------------------+----------+----------+----------|
| | 1 wait state | Open | Closed | Open |
|-----+---------------------+----------+----------+----------|
| | 2 wait states | Open | Open | Closed |
|------------------------------------------------------------|
| Note:On some versions of this board (designated |
| F001), wait state circuitry is not included. Set |
| these boards to the Disabled setting. All other |
| boards should be set to one of the other three |
| settings. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRIVE LED CONFIGURATION |
|------------------------------------------------------------|
| Setting | W4 | W10 |
|------------------------------------------+--------+--------|
| Non-latched; LED is on when drive is | Closed | Open |
| active | | |
|------------------------------------------+--------+--------|
| Latched; LED is on when drive is not | Open | Closed |
| active | | |
+------------------------------------------------------------+