Dell OptiPlex GL Service Manual - Page 22

Interrupt Assignments, Table 1-2., Jumper Descriptions - 200

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Jumper PSWD BIOS RSRVD4 RSRVD3 RSRVD2 RSRVD1 200MHZ 180MHZ Table 1-2. Jumper Descriptions Description Default Setting Password enable/disable. Installed (password feature Jumper installed, activates enabled) password feature. Used for internal Dell debug tool. Not installed (reserved, do not change) Reserved. Not installed (reserved, do not change) Microprocessor speed. Microprocessor speed. Installed if the microprocessor's internal speed is 200 MHz, or else not installed Installed if the microprocessor's internal speed is 180 MHz, or else not installed Interrupt Assignments Table 1-3. Interrupt Assignments IRQ Line Used By/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 connected 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. IRQ6 Generated by super I/O controller to indicate that diskette or tape drive requires service. IRQ7 Generated by super I/O controller to indicate that device connected to parallel port requires service. 1-14 Dell OptiPlex GXpro Systems Service Manual

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1-14
Dell OptiPlex GX
pro
Systems Service Manual
I
nterrupt Assignments
Table 1-2.
Jumper Descriptions
Jumper
Description
Default
Setting
PSWD
Password enable/disable.
Jumper installed, activates
password feature.
Installed (password feature
enabled)
BIOS
Used for internal Dell
debug tool.
Not installed (
reserved, do not
change
)
RSRVD4
RSRVD3
RSRVD2
RSRVD1
Reserved.
Not installed (
reserved, do not
change
)
200MHZ
Microprocessor speed.
Installed if the micro-
processor’s internal speed is
200 MHz, or else not
installed
180MHZ
Microprocessor speed.
Installed if the micro-
processor’s internal speed is
180 MHz, or else not
installed
Table 1-3.
Interrupt Assignments
IRQ Line
Used By/Available
IRQ0
Generated by system timer.
IRQ1
Generated by keyboard controller to indicate that keyboard’s out-
put 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.
IRQ6
Generated by super I/O controller to indicate that diskette or tape
drive requires service.
IRQ7
Generated by super I/O controller to indicate that device con-
nected to parallel port requires service.