...because we can't all be on the bleeding edge...





WD1004A-WX1 (REV. A)

WESTERN DIGITAL CORPORATION

WD1004A-WX1 (REV. A)

Data bus: 8-bit, PC/AT, PC/AT

Size: Half-length, full-height card

Hard drives supported: Two MFM 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

I/O PORT & BIOS ADDRESS

I/O Port Address

BIOS Address

W21

W22

320-323h

C8000-C9FFFh

open

open

 

324-327h

CA000-CBFFFh

closed

open

 

328-32Bh

CC000-CDFFFh

open

closed

 

32C-32Fh

CE000-CFFFFh

closed

closed

Note: The function of W17-W20 & W25-W28 is unidentified.

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.