Dell 4100, 200, 180 service manual Interrupt Assignments, Jumper Descriptions

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	Reserved	Not installed (reserved; do not
RSRVD1		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

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

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