Instruction Manual

1-6 Dell Latitude XPi CD Service Manual
• If the computer is in suspend mode (the power/suspend indicator flashes
every 8 seconds), if the display is closed, and if no external monitor is
attached, sliding the power button has no effect on the power state. The
computer remains in suspend mode.
• If the computer is in suspend-to-disk mode, sliding the power button causes
the computer to initiate the resume-from-disk operation.
I nterrupt Assignments
Table 1-1. Interrupt Assignments
IRQ Line Used/Available
IRQ0 Generated by the system timer
IRQ1 Generated by the keyboard controller to signal that the keyboard
output buffer is full
IRQ2 Generated internally by the interrupt controller to enable IRQ8
through IRQ15
IRQ3 Available for use by a PC Card unless the built-in serial port or
infrared port is configured for COM2 (the default)
IRQ4 Available for use by a PC Card unless the built-in serial port is
configured for COM1 (the default)
IRQ5 Available for use by the audio controller
IRQ6 Generated by the diskette drive controller to indicate that the
diskette drive requires the attention of the microprocessor
IRQ7 Available for use by a PC Card or audio controller if the built-in
parallel port is disabled
IRQ8 Generated by the system I/O controller’s RTC
IRQ9 Available for use by the PC Card interrupt controller or the
audio controller
IRQ10 Available for use by a PC Card or audio controller unless the
Advanced Port Replicator is attached
IRQ11 Available for use by a PC Card unless the Advanced Port Repli-
cator is attached
IRQ12 Generated by the keyboard controller to indicate that the output
buffer of the integrated trackball or external PS/2 mouse is full
IRQ13 Reserved for use by the internal coprocessor
IRQ14 Generated by the hard-disk drive to indicate that the drive
requires the attention of the microprocessor
IRQ15 Reserved for the CD-ROM drive