Service Manual

1-18 Dell PowerEdge 6300 Systems Service Manual
Interrupt Assignments
Table 1-4 lists the default IRQ line assignments.
Table 1-3. Jumper Descriptions
Jumper Settings
PASSWD Installed (default) to enable the password feature. Remove
the jumper and boot the computer to remove an existing
password.
CARDBIOS Not installed (default) to allow normal boot operation from
the system BIOS.
Install the jumper only to boot the system 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 com-
puter to clear the ISA configuration settings. Remove the
jumper before restoring ISA configuration information.
RSVD1 Do not install. Reserved for future microprocessor speed.
RSVD2 Do not install. Reserved for future microprocessor speed.
350MHZ Do not install.
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).
500MHZ Installed only if the microprocessor’s internal speed is
500 MHz (when available).
Table 1-4. Interrupt Assignments
IRQ Line Used/Available
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