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
|
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 IRQ5 |
W27 |
closed |
|
Hard drive Interrupt request is IRQ2 |
W27 |
open | |
|
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. |
