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# WESTERN DIGITAL CORPORATION
WD1004-27X, WD1004A-27X
Replaces the WD1002-27X and WD1002A-27X respectively
Data bus: 8-bit, PC/AT
Size: Half-length, full-height card
Hard drives supported: 2 RLL ST506/412 drives
Floppy drives supported: None
Maximum heads/cyl.: 16 heads and 1024 cylinders
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-------------------------------------------+----------------|
| 34-pin control cable connector-hard drive | J1 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 0 | J2 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 1 | J3 |
|-------------------------------------------+----------------|
| 5-pin connector-DC power | J4 |
|-------------------------------------------+----------------|
| 4-pin connector-drive active LED | J5 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USERS CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|---------------------------------------+----------+---------|
| » | Hard drive Interrupt request is | W27 | closed |
| | IRQ5 | | |
|---+-----------------------------------+----------+---------|
| | Hard drive Interrupt request is | W27 | open |
| | IRQ2 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS DRIVE TYPE TABLE - (WD1004-27X ONLY) |
|------------------------------------------------------------|
| Table # | W17 | W18 | W19 | W20 |Cap. |Hds. |Cyls. |
|---------+-------+-------+-------+-------+-----+-----+------|
| | 0 |closed |closed |closed |closed |65MB | 6 | 820 |
|---+-----+-------+-------+-------+-------+-----+-----+------|
| | 1 | open |closed | open |closed |42MB | 4 | 782 |
|---+-----+-------+-------+-------+-------+-----+-----+------|
| | 2 |closed | open |closed | open |21MB | 2 | 782 |
|---+-----+-------+-------+-------+-------+-----+-----+------|
|» | 3 | open | open | open | open |32MB | 4 | 615 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O PORT & BIOS ADDRESS JUMPERS - (WD1004-27X ONLY) |
|------------------------------------------------------------|
| I/O Port Address | BIOS Address | W21 | W22 |
|----------------------+---------------+----------+----------|
| » | 320-323h | C800-C9FFh | open | open |
|-------+--------------+---------------+----------+----------|
| | 324-327h | CA00-CBFFh | closed | open |
|-------+--------------+---------------+----------+----------|
| | 328-32Bh | CC00-CDFFh | open | closed |
|-------+--------------+---------------+----------+----------|
| | 32C-32Fh | CE00-CFFFh | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SECTORS AND CONFIGURATION OPTION |
|------------------------------------------------------------|
| Table | Sectors | Translate | Dynamic | W25 | W26 |
|--------+----------+-----------+----------+--------+--------|
| RLL | 17 | yes | no | closed | open |
|--------+----------+-----------+----------+--------+--------|
| RLL | 26 | no | yes | open | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| This controller has a built-in low-level format program. |
| To enter the program run the DEBUG utility supplied with |
| DOS and at the prompt enter: G=C800:5. |
+------------------------------------------------------------+