Service manual

Troubleshooting Your Computer: Dell Latitude CP
IRQ2 Reserved; 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 or COM4
IRQ4 Available for use by a PC Card unless the built-in serial port or infrared port is
configured for COM1 (the default) or COM3
IRQ5 Generated 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 parallel port is disabled
IRQ8 Reserved; generated by the system I/O controller's RTC
IRQ9 Reserved; generated by the video controller
IRQ10 Available for use by a PC Card or audio controller unless the C/Port advanced Port
Replicator (APR) or C/Dock Expansion Station is attached
IRQ11 Generated by the USB and PC Card controllers; available for use by a PC Card
IRQ12 Reserved; generated by the keyboard controller to indicate that the output buffer of the
touch pad or external PS/2 mouse is full
IRQ13 Reserved; generated by the math coprocessor
IRQ14 Reserved; generated by the hard-disk drive to indicate that the drive requires the attention
of the microprocessor
IRQ15 Reserved; generated by CD-ROM drive in the modular bay to indicate that the drive
requires the attention of the microprocessor
NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary in the
online System User's Guide.
Memory Allocations
Table 3-5 provides a map of the conventional memory area. When the microprocessor or a
program addresses a location within the conventional memory range, it is physically
addressing a location in main memory.
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