WESTERN DIGITAL CORPORATION
WDXT-GEN2, WDXT-GEN2 PLUS, WDXT-GEN2R
Data bus: 8-bit, PC/XT
Size: Half-length, full-height card
Hard drives supported: Two MFM ST506/412 drives (WDXT-GEN2/GEN2 PLUS)
Two RLL ST506/412 drives (WDXT-GEN2R)
Floppy drives supported: None
Maximum heads/cyl.: Maximum 8 heads and 1024 cylinders (WDXT-GEN2/GEN2 PLUS)
Maximum 15 heads and 1024 cylinders (WDXT-GEN2R)
|
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 (optional) |
J4 |
|
4-pin connector-drive active LED |
J5 |
|
SECTORS AND CONFIGURATION OPTIONS FOR RLL TABLE (WDXT-GEN2R) | |||||
|
Sectors |
Translation |
Dynamic |
R25 |
R26 | |
| » |
17 |
yes |
no |
closed |
open |
| » |
26 |
no |
yes |
open |
closed |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Location |
Setting | |
| » |
Internal BIOS selected |
R23 |
open |
| » |
External BIOS selected |
R23 |
closed |
| » |
Factory configured - do not alter (WDXT-GEN2/GEN2 PLUS) |
R25 |
open |
| » |
Factory configured - do not alter (WDXT-GEN2/GEN2 PLUS) |
R26 |
open |
| » |
IRQ5 select |
R27 |
open |
| » |
IRQ2 select |
R27 |
closed |
| » |
XT mode enabled |
R28 |
open |
| » |
XT mode disabled |
R28 |
closed |
|
DRIVE TYPE CONFIGURATION (WDXT-GEN2/GEN2 PLUS) | ||||||||
|
Drive 0 |
Drive 1 | |||||||
|
Table # |
R17 |
R18 |
R19 |
R20 |
Capacity |
Heads |
Cyls. | |
| » |
3 |
open |
open |
open |
open |
21MB |
4 |
615 |
|
0 |
closed |
closed |
closed |
closed |
21MB |
4 |
612 | |
|
1 |
open |
closed |
open |
closed |
10MB |
4 |
306 | |
|
2 |
closed |
open |
closed |
open |
10MB |
2 |
615 | |
|
DRIVE TYPE CONFIGURATION (WDXT-GEN2R) | ||||||||
|
Drive 0 |
Drive 1 | |||||||
|
Table # |
R17 |
R18 |
R19 |
R20 |
Capacity |
Heads |
Cyls. | |
| » |
3 |
open |
open |
open |
open |
32MB |
4 |
615 |
|
0 |
closed |
closed |
closed |
closed |
65MB |
6 |
820 | |
|
1 |
open |
closed |
open |
closed |
42MB |
4 |
782 | |
|
2 |
closed |
open |
closed |
open |
21MB |
2 |
782 | |
|
ADDRESS SELECTION | ||||
|
Controller Address |
BIOS Address |
R21 |
R22 | |
| » |
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 |
|
The controller has a built-in low level format. To enter the program run the DEBUG utility supplied with DOS and at the prompt enter: G=C800:5 |