Dell OptiPlex NX1 Service Manual - Page 31
external system clock speed operates
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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). * One set of speed jumpers must have a jumper plug installed; otherwise, the system defaults to 350 MHz. IRQ0 IRQ1 IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 Generated by system timer. Generated by keyboard controller. Generated internally by interrupt controller to enable IRQ8 through IRQ15. Generated by super I/O controller to indicate that the device connected to the serial port (COM2 or COM4) requires service. Generated by super I/O controller to indicate that the device connected to the serial port (COM1 or COM3) requires service. Available for use by an expansion card. Generated by super I/O controller to indicate that diskette or tape drive requires service. Generated by super I/O controller to indicate that device connected to parallel port requires service. System Overview 1-19