WESTERN DIGITAL CORPORATION
WD1004A-WX1 (REV. A)
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
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CONNECTIONS | |
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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 |
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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 | |
|
Note: The function of W17-W20 & W25-W28 is unidentified. | ||||
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MISCELLANEOUS TECHNICAL NOTES |
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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. |