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WD1002A-WX1 (VER.1)

WESTERN DIGITAL CORPORATION

WD1002A-WX1 (VER.1)

Data Bus

8-bit

Card Size

Proprietary

Hard Drives supported

Two ST-506/412(MFM) drives

Floppy drives supported

None

CONNECTIONS

Function

Location

Function

Location

34-pin control cable connector-hard drive

J1

5-pin connector-DC power

J4

20-pin data cable connector-drive 0

J2

 

 

USER CONFIGURABLE SETTINGS

Function

Label

Position

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 ROM size 32K or 64K (hard-wired)

W5

pins 1 & 2 closed

 

BIOS ROM size 16K

W5

pins 2 & 3 closed

8 head hard drive with RWC supported

W6

pins 2 & 3 closed

 

16 head hard drive supported (head select 3)

W6

pins 1 & 2 closed

Hard drive Interrupt is IRQ5 (hard-wired)

W7

pins 1 & 2 closed

 

Hard drive Interrupt is IRQ2

W7

pins 2 & 3 closed

Single controller setting, primary controller

W8

pins 2 & 3 closed

 

Dual controller setting, secondary controller

W8

pins 1 & 2 closed

Factory configured - Do not alter

S1/5

Open

Factory configured - Do not alter

S1/6

Open

Factory configured - Do not alter

S1/7

Open

Factory configured - Do not alter

S1/8

Open

BIOS REVISION DRIVE TYPE TABLE

Drive1

Drive 0

 

 

#

S1/1

S1/2

S1/3

S1/4

Cap.

Hds

Cyls.

WP

RWC

 

0

Closed

Closed

Closed

Closed

20 MB

4

612

613

613

 

1

Open

Closed

Open

Closed

10 MB

2

612

128

128

 

2

Closed

Open

Closed

Open

20 MB

4

612

128

613

3

Open

Open

Open

Open

10 MB

4

306

0

306

Note: S1/1 and S1/2 select the setting for drive1 & S1/3 and S1/4 select the setting for drive 0

MISCELLANEOUS TECHNICAL NOTES

Note: 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 may not be changed.