Western Digital WD1004A-WX1 User Manual

READ THIS FIRST

INSTALLATION GUIDE

WD1004A-WXl

Winchester Disk Controller Board

FEBRUARY 1989

IDENTIFY DRIVE

The WD1004A-WX1 board works with any hard disk drive that has the ST506/412
drive interface and no more than 1024 cylinders and 16 heads. The Seagate 225
hard disk drive unit is such a drive.

Look in your drive manual to verify that you have an ST506/412 MFM drive or
check with your dealer.

Then check the drive manual for the drive parameters, such as those listed in Table

1-1. You'll need this information for the low level format.
Table 1-1 WD1004A-WX1 Default Drive Parameters

Formatted
Capacity

21MB 4 615 307/none 75µsec

This board does not work with RLL drives. If you have an RLL drive you need
either the WD1004A-27X or WD1004-27X board.

Number of
Heads

Number of
Cylinders

1-2

Pre–Comp
RWC

Step
Rate

IDENTIFY BOARD

Figure 1-1 shows the connector locations (J1, J2, J3, J4, and J5) on the WD1004A­WXl board and the location of the jumpers (W17 to W22, R23, and W25 to W28).
The (J4) drive power connector is on the WD1004A-WXl board to connect power
to FileCard® drives.

BIOS ROM Incompatibility

BIOS is an acronym for Basic Input Output System. ROM is a n acronym for Read
Only Memory. The BIOS ROM is a program on a computer chip that tells your
computer how to operate devices attached to your computer.

Some XT compatible computers do not operate with the Western Digital BIOS
ROM because of an incompatibility. Most of these computers are listed in Ap­pendix A. Check Table A-1 on page A-11 to see if you have one of these com­puters.

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