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1-18 Dell PowerEdge 4300 Systems Service Manual
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Table 1-4 lists the default IRQ line assignments.
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CARDBIOS
Not
installed (default) to allow normal boot operation from
the system BIOS. Install the jumper only to boot the sys-
tem from a BIOS expansion card.
ISA_CLR
Not
installed (default) to retain the ISA configuration set-
tings at system boot. Install the jumper and boot the
computer to clear the ISA configuration settings. Remove
the jumper before restoring ISA configuration information.
PASSWD Installed (default) to enable the password feature. Remove
the jumper and boot the computer to remove an existing
password.
333MHZ Do
not
install.
350MHZ Installed only if the microprocessor’s internal speed is
350 MHz.
400MHZ Installed only if the microprocessor’s internal speed is
400 MHz.
450MHZ Installed only if the microprocessor’s internal speed is
450 MHz (when available).
RSVD1 Do
not
install. Reserved for future microprocessor speed.
RSVD2 Do
not
install. Reserved for future microprocessor speed.
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IRQ0 Used by the system timer
IRQ1 Used by the keyboard to signal that the output buffer is full
IRQ2 Used by interrupt controller 1 to enable IRQ8 through IRQ15
IRQ3 Used by serial port 2 (COM2 and COM4)
IRQ4 Used by serial port 1 (COM1 and COM3)
IRQ5 Available unless used by a secondary parallel port
IRQ6 Used by the diskette drive controller
IRQ7 Used by the primary parallel port
IRQ8 Used by the RTC
IRQ9 Used for power management functions
IRQ10 Available