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 |