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1-22 Dell PowerEdge 4200 Systems Service Manual
Interrupt Assignments
Table 1-2. Jumper Descriptions
Jumper Description Default Setting
EISA Clear EISA Configuration Not installed (utility settings are
retained at system boot)
VGA Integrated video controller Installed (controller is enabled)
PASSWD Password enable/disable Installed (password feature is
enabled)
CRDBIOS Reserved Not installed (reserved; do not
change)
RSRVD2
RSRVD1
Reserved Not installed (reserved; do not
change)
333MHZ Microprocessor speed Installed only if the micro-
processor’s internal speed is
333 MHz (when supported)
300MHZ Microprocessor speed Installed only if the micro-
processor’s internal speed is
300 MHz
266MHZ Microprocessor speed Installed only if the micro-
processor’s internal speed is
266 MHz
233MHZ Microprocessor speed Installed only if the micro-
processor’s internal speed is
233 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