Interrupt Assignments - Dell 4100 Service Manual

1-22 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual
Table 1-2. Jumper Descriptions
Jumper Description
EISA EISA Configuration Utility
VGA Integrated video controller
PASSWD Password enable/disable
CRDBIOS Reserved
RSRVD2 Reserved
RSRVD1
200MHZ Microprocessor speed
180MHZ Microprocessor speed

Interrupt Assignments

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 Generated by super I/O controller to indicate that device con-
and nected to corresponding serial port requires service (IRQ3 for
IRQ4 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
Default Setting
Not installed (utility settings are
retained at system boot)
Installed (controller is enabled)
Installed (password feature
enabled)
Not installed (reserved; do not
change)
Not installed (reserved; do not
change)
Installed only if the micro-
processor's internal speed is
200 MHz
Installed only if the micro-
processor's internal speed is
180 MHz