B
JUMPERS
The WD1004 board has a row of jumper pins at W17 to W22 and W25 to W28. The
WD1004A board has a row of jumper pins at W25 to W28. Adding a jumper shorting plug at
any of these locations, selects a hardware configurations that is different from the default
value selected by Western Digital.
Jumper Functions (W17 to W22, R23, and W25 to W28)
The following list explains the jumper functions.
·
W17 & W18 selects factory drive tables for the first hard disk
·
W19 & W20 selects factory drive tables for the second hard disk
·
W21 and W22 selects the controller and BIOS address ranges
·
R23 disables the Western Digital BIOS ROM on WD1004 and WD1004A
boards
·
W25 and W26 set sector translation and dynamic configuration
·
W27 sets the hardware interrupt (IRQ) value for the hard disk drive
·
W28 allows the controller to operate with an XT computer when the jumper
is OUT
†
Not available on the WD1004A-27X board
.
B–1
Summary of Contents for WD1004-27X
Page 1: ...READ THIS FIRST INSTALLATION GUIDE WD1004 27X...
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