Interrupt Assignments; Table 1-1. System-Board Jumper Descriptions; Table 1-2. Interrupt Assignments - Dell OptiPlex GXa Service Manual

Table 1-1. System-Board Jumper Descriptions

Jumper Description
RSVD2 Reserved
300MHZ Microprocessor
*
speed
266MHZ Microprocessor
*
speed
233MHZ Microprocessor
*
speed
BIOS Reserved
PSWD Password
enable or
disable
* One set of speed jumpers must have a jumper plug installed; otherwise the system
defaults to 233 MHz
.

Interrupt Assignments

Table 1-2. 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 Available for use by an expansion card.
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.
NOTE: The built-in sound controller and built-in NIC controller are assigned available
IRQs automatically during system start-up.
Settings
Jumper not installed (default).
Install jumper if the microprocessor's
internal speed is 300 MHz; otherwise the
jumper should not be installed.
Install jumper if the microprocessor's
internal speed is 266 MHz; otherwise the
jumper should not be installed.
Install jumper if the microprocessor's
internal speed is 233 MHz; otherwise the
jumper should not be installed.
Do not install jumper.
Install to enable the password feature
(default).
System Overview 1-15