WESTERN DIGITAL CORPORATION
WD1002A-WX1
Replaced by the WD1004A-WX1
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Data bus: 8-bit, PC/XT
Size: Full-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 |
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34-pin control cable connector-hard drive |
J1 |
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20-pin data cable connector-drive 0 |
J2 |
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20-pin data cable connector-drive 1 |
J3 |
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5-pin connector-DC power |
J4 |
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USER CONFIGURABLE SETTINGS | |||
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Function |
Location |
Setting | |
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BIOS enabled |
W3 |
closed | |
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BIOS disabled |
W3 |
open | |
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I/O port address 320h |
W4 |
pins 2 & 3 closed | |
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I/O port address 324h |
W4 |
pins 1 & 2 closed | |
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BIOS ROM size 32K or 64K (hard-wired) |
W5 |
pins 1 & 2 closed | |
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BIOS ROM size 16K |
W5 |
pins 2 & 3 closed | |
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8 head hard drive with RWC supported |
W6 |
pins 2 & 3 closed | |
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16 head hard drive supported (head select 3) |
W6 |
pins 1 & 2 closed | |
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x Hard Drive Interrupt is IRQ5 (hard-wired) |
W7 |
pins 1 & 2 closed | |
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Hard Drive Interrupt is IRQ2 |
W7 |
pins 2 & 3 closed | |
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Single controller setting, primary controller |
W8 |
pins 2 & 3 closed | |
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Dual controller setting, secondary controller |
W8 |
pins 1 & 2 closed | |
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Not used |
S1/jumper 5 |
open | |
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Not used |
S1/jumper 6 |
open | |
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*Hard Drive Interrupt is IRQ5 |
S1/jumper 7 |
open | |
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*Hard Drive Interrupt is IRQ2 |
S1/jumper 7 |
closed | |
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*XT mode enabled |
S1/jumper 8 |
open | |
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*AT mode enabled |
S1/jumper 8 |
closed | |
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Note:* This controller can be purchased with several different BIOS revisions. These jumpers are not applicable when used with some BIOS revisions. | |||
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BIOS REVISION "SUPER BIOS" DRIVE TYPE TABLE | |||||||||
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Drive 0 |
Drive 1 | ||||||||
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# |
S1/1 |
S1/2 |
S1/3 |
S1/4 |
Cap. |
Hds |
Cyls. |
WP |
RWC |
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0 |
closed |
closed |
closed |
closed |
21MB |
4 |
612 |
450 |
450 |
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1 |
open |
closed |
open |
closed |
10MB |
4 |
306 |
0 |
153 |
|
2 |
closed |
open |
closed |
open |
10MB |
2 |
615 |
450 |
450 |
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3 |
open |
open |
open |
open |
21MB |
4 |
615 |
450 |
450 |
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BIOS REVISION "G" DRIVE TYPE TABLE | |||||||||
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# |
Drive 0 |
Drive 1 | |||||||
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# |
S1/1 |
S1/2 |
S1/3 |
S1/4 |
Cap. |
Hds. |
Cyl. |
WP |
RWC |
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0 |
closed |
closed |
closed |
closed |
20MB |
4 |
612 |
none |
none |
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1 |
open |
closed |
open |
closed |
10MB |
2 |
612 |
128 |
128 |
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2 |
closed |
open |
closed |
open |
20MB |
4 |
612 |
128 |
none |
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3 |
open |
open |
open |
open |
10MB |
4 |
306 |
0 |
none |
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BIOS REVISION "H" DRIVE TYPE TABLE - S1 JUMPERS 3, 4, & 8 CONFIGURE DRIVE 0 JUMPERS 1, 2 & 7 CONFIGURE DRIVE 1 | ||||||||
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# |
S1/1 & 3 |
S1/2 & 4 |
S1/7 & 8 |
Cap. |
Hds |
Cyl. |
WP |
RWC |
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0 |
closed |
closed |
closed |
42MB |
5 |
977 |
none |
none |
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1 |
open |
closed |
closed |
31MB |
5 |
733 |
300 |
none |
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2 |
closed |
open |
closed |
33MB |
6 |
640 |
none |
none |
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3 |
open |
open |
closed |
62MB |
8 |
1024 |
1024 |
1024 |
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4 |
closed |
closed |
open |
42MB |
6 |
820 |
none |
none |
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5 |
open |
closed |
open |
10MB |
2 |
612 |
128 |
128 |
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6 |
closed |
open |
open |
20MB |
4 |
612 |
128 |
none |
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7 |
open |
open |
open |
10MB |
4 |
306 |
0 |
none |
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MISCELLANEOUS TECHNICAL NOTES |
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The Super BIOS revision includes the following features not found in other revisions: ability to format bad tracks, dual controller operation, automatic configuration, virtual drive operation, and PC/AT compatibility. 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. Two additional jumpers may be present, W1 & W2, and are reserved for factory use and must not be changed. |