WD1004A-WX1 Hard Disk/Floppy Controller Settings and Configuration
WESTERN DIGITAL CORPORATION
WD1004A-WX1
Data bus: 8-bit, PC/AT, PC/AT
Size: Half-length, full-height card
Hard drives supported: Two MFM ST506/412 drives
Floppy drives supported: None
Maximum heads/cyl.: 16 heads and 1024 cylinders
USERS CONFIGURABLE SETTINGS | |||
Function | Location | Setting | |
| » | Hard drive Interrupt request is IRQ5 | W27 | closed |
Hard drive Interrupt request is IRQ2 | W27 | open | |
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 |
BIOS DRIVE TYPE TABLE - (WD1004-27X ONLY) | ||||||||
Table # | W17 | W18 | W19 | W20 | Cap. | Hds. | Cyls. | |
0 | closed | closed | closed | closed | 21MB | 4 | 612 | |
1 | open | closed | open | closed | 10MB | 4 | 306 | |
2 | closed | open | closed | open | 10MB | 2 | 615 | |
| » | 3 | open | open | open | open | 21MB | 4 | 615 |
I/O PORT & BIOS ADDRESS | ||||
I/O Port Address | BIOS Address | W21 | W22 | |
| » | 320-323h | C8000-C9FFFh | open | open |
324-327h | CA000-CBFFFh | closed | open | |
328-32Bh | CC000-CDFFFh | open | closed | |
32C-32Fh | CE000-CFFFFh | closed | 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. If the system is not compatible with the Western Digital BIOS, a resistor must be installed at R23 to disable the WD BIOS |
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