Dell OptiPlex NX1 - Manual (Page 32)

1-20 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual
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350MHZ * Microprocessor
speed Install jumper if the microprocessor’s
internal speed is 350 MHz; otherwise, the
jumper should not be installed.
333MHZ * Microprocessor
speed Install jumper if the microprocessor’s
internal speed is 333 MHz; otherwise, the
jumper should not be installed.
300MHZ * Microprocessor
speed Reserved. Jumper not installed (default).
266MHZ * Microprocessor
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.
IRQ8 Generated by RTC alarm event.
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* One set of speed jumpers must have a jumper plug installed; otherwise, the system
defaults to 350 MHz.