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WD1002S-WX2A

WESTERN DIGITAL CORPORATION

WD1002S-WX2A

Data bus: 8-bit, PC/XT

Size: Full-length, full-height card

Hard drives supported: Two MFM ST506/412 drives

Floppy drives supported: None

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

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Not used

W1 & W2

N/A

BIOS enabled

W3

closed

 

BIOS disabled

W3

open

I/O port address 320h

W4

pins 2 & 3 closed

 

I/O port address 324h

W4

pins 1 & 2 closed

BIOS size 32K or 64K

W5

pins 1 & 2 closed

 

BIOS size 16K

W5

pins 2 & 3 closed

16 head hard drive supported (Head Select 3)

W6

pins 1 & 2 closed

 

8 Head hard drive with RWC supported

W6

pins 2 & 3 closed

Hard Drive Interrupt is IRQ5

W7

pins 1 & 2 closed

 

Hard Drive Interrupt is IRQ2

W7

pins 2 & 3 closed

Factory setting

W8

pins 2 & 3 closed

 

CO23 setting

W9

pins 1 & 2 closed

Standard Configuration

W10

pins 2 & 3 closed

 

Special feature

W10

pins 1 & 2 closed

Factory configured - do not alter

SW1/jumper 5

open

Factory configured - do not alter

SW1/jumper 6

open

Hard Drive Interrupt is IRQ5

SW1/jumper 7

open

 

Hard Drive Interrupt is IRQ2 (JP7/pins 2-3 must be closed and a custom BIOS must be install)

SW1/jumper 7

closed

AT mode enabled

SW1/jumper 8

closed

 

XT mode enabled

SW1/jumper 8

open

BIOS REVISION "SUPER BIOS" DRIVE TYPE TABLE

 

Drive 1

Drive 0

         

#

SW1/1

SW1/2

SW1/3

SW1/4

Cap.

Hds

Cyls.

WP

RWC

0

closed

closed

closed

closed

21MB

4

612

450

450

1

open

closed

open

closed

10MB

4

306

0

153

2

closed

open

closed

open

10MB

2

615

450

450

3

open

open

open

open

21MB

4

615

450

450

BIOS REVISION "G" DRIVE TYPE TABLE

#

Drive 1

Drive 0

         

#

SW1/1

SW1/2

SW1/3

SW1/4

Cap.

Hds.

Cyl.

WP

RWC

0

closed

closed

closed

closed

20MB

4

612

0

none

1

open

closed

open

closed

10MB

2

612

128

128

2

closed

open

closed

open

20MB

4

612

128

none

3

open

open

open

open

10MB

4

306

0

none

BIOS REVISION "H" DRIVE TYPE TABLE

JUMPERS 3, 4, & 8 CONFIGURE DRIVE 0

JUMPERS 1, 2 & 7 CONFIGURE DRIVE 1

#

SW1/1 & 3

SW1/2 & 4

SW1/7 & 8

Cap.

Hds

Cyl.

WP

RWC

0

closed

closed

closed

42MB

5

977

none

none

1

open

closed

closed

31MB

5

733

300

none

2

closed

open

closed

33MB

6

640

none

none

3

open

open

closed

62MB

8

1024

1024

1024

4

closed

closed

open

42MB

6

820

none

none

5

open

closed

open

10MB

2

612

128

128

6

closed

open

open

20MB

4

612

128

none

7

open

open

open

10MB

4

306

0

none

MISCELLANEOUS TECHNICAL NOTES

This controller can be purchased with several different BIOS revisions. 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.