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1-14 Dell OptiPlex GX
pro
Systems Service Manual
I
nterrupt Assignments
Table 1-2. Jumper Descriptions
Jumper Description
Default
Setting
PSWD Password enable/disable.
Jumper installed, activates
password feature.
Installed (password feature
enabled)
BIOS Used for internal Dell
debug tool.
Not installed (reserved, do not
change)
RSRVD4
RSRVD3
RSRVD2
RSRVD1
Reserved. Not installed (reserved, do not
change)
200MHZ Microprocessor speed. Installed if the micro-
processor’s internal speed is
200 MHz, or else not
installed
180MHZ Microprocessor speed. Installed if the micro-
processor’s internal speed is
180 MHz, or else not
installed
Table 1-3. Interrupt Assignments
IRQ Line Used By/Available
IRQ0 Generated by system timer.
IRQ1 Generated by keyboard controller to indicate that keyboard’s out-
put buffer is full.
IRQ2 Generated internally by interrupt controller to enable IRQ8
through IRQ15.
IRQ3
and
IRQ4
Generated by super I/O controller to indicate that device con-
nected to corresponding serial port requires service (IRQ3 for
COM2 or COM4; IRQ4 for COM1 or COM3).
IRQ5 Available for use by expansion card unless this IRQ line is used
by secondary parallel port.
IRQ6 Generated by super I/O controller to indicate that diskette or tape
drive requires service.
IRQ7 Generated by super I/O controller to indicate that device con-
nected to parallel port requires service.