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Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual
Interrupt Assignments
Table 1-2. Jumper Descriptions
Jumper
Description
Default Setting
EISA
EISA Configuration Utility
Not installed (utility settings are
retained at system boot)
VGA
Integrated video controller
Installed (controller is enabled)
PASSWD
Password enable/disable
Installed (password feature
enabled)
CRDBIOS
Reserved
Not installed (reserved;
do not
change
)
RSRVD2
RSRVD1
Reserved
Not installed (reserved;
do not
change
)
200MHZ
Microprocessor speed
Installed only if the micro-
processor’s internal speed is
200 MHz
180MHZ
Microprocessor speed
Installed only if the micro-
processor’s internal speed is
180 MHz
Table 1-3. Interrupt Assignments
IRQ Line
Used/Available
IRQ0
Generated by system timer
IRQ1
Generated by keyboard controller to indicate that keyboard’s
output 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 drive
requires service
IRQ7
Generated by super I/O controller to indicate that device con-
nected to parallel port requires service
IRQ8
Generated by keyboard controller for each tick of RTC
IRQ9
Available for use by expansion card