I
nstallation Guide
1-6
Western Digital Corporation
Jumper Settings for the WDAT-440
The WDAT-440 board contains seven jumper blocks, W3 through
W9, which define hardware parameters. By moving the jumper shunts,
you can change the definition of the hardware which is attached to your
computer. The jumpers must be configured to match your system
hardware.
Do I Need to Change Any Jumpers?
Probably not. We recommend that you not change any of the
jumper settings unless you have one of the following conditions:
•
You have an original Conner CP342 or CP3O22 intelligent
drive in an IBM AT.
•
You want to set an alternate address at 370-377.
•
You have a two-speed floppy drive.
•
You want to change printer port or serial port definitions or
addresses. You can change the jumper settings to re-configure
the parallel port as LPT2. You can also re-configure the
external serial port as COM3 and the internal serial port as
COM4 by moving the jumpers.
•
You want to connect logic ground to the chassis.
The factory default jumper settings are shown below. Jumper
blocks W3 and W9 define the hard disk drive interface and W4 and W5
define the floppy address and floppy drive speed. The jumpers at W7 and
W8 define the parallel and serial ports. W6 defines the chassis-to-ground
logic (chassis ground is independent of logic ground). Jumper settings
are discussed in detail in Appendix B, Tables B-6 through B-12.
If you need to change the jumper settings, do this before you
install the WDAT440 board into your computer. You change the jumper
settings by installing or removing the jumper shunts on the jumper
blocks (W3 through W9). Go to Appendix B for exact instructions
BEFORE you change the jumper settings. If you do not need to change
the jumpers, you can proceed to Chapter 2.
