Dell OptiPlex G1, Service Manual

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1-18 Dell OptiPlex G1 Managed PC Systems Service Manual
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333MHZ
*
Micro-
processor
speed Install jumper if the microprocessor’s
internal speed is 333 MHz; otherwise, the
jumper should not be installed.
300MHZ
*
Micro-
processor
speed Install jumper if the microprocessor’s
internal speed is 300 MHz; otherwise, the
jumper should not be installed.
266MHZ
*
Micro-
processor
speed Install jumper if the microprocessor’s
internal speed is 266 MHz; otherwise, the
jumper should not be installed.
BUS66M External system
clock Install jumper to set the external system
clock speed at 66 MHz; otherwise, the
external system clock speed operates at
100 MHz (default).
BIOS Reserved Jumper not installed (default).
PSWD Password
enable or
disable
Install to enable the password feature
(default).
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IRQ0 Generated by system timer.
IRQ1 Generated by keyboard controller.
IRQ2 Generated internally by interrupt controller to enable IRQ8
through IRQ15.
IRQ3 Generated by super I/O controller to indicate that the device con-
nected to the serial port (COM2 or COM4) requires service.
IRQ4 Generated by super I/O controller to indicate that the device con-
nected to the serial port (COM1 or COM3) requires service.
IRQ5 Available for use by an expansion card.
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.
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* One set of speed jumpers must have a jumper plug installed; otherwise, the system
defaults to an undetermined speed.