Users Guide

Hardware Configuration Features B-17
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Problems can arise if two devices attempt to use the same IRQ line. To avoid this type
of conflict, check the documentation for the default IRQ line setting for each installed
device. Then consult Table B-9 to configure each device for one of the available IRQ or
other lines.
NOTE: Interrupts for the on-board sound, NIC, and both SCSI channels are assigned
dynamically by the system basic input/output system (BIOS).
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A microprocessor and programs operating under MS-DOS (real-mode operation) can
address only 1 megabyte (MB) (1024 kilobytes [KB]) of system memory. This area is
divided into
conventional memory
(sometimes called
base memory
) and upper memory.
All system memory above this 1 MB is called
extended memory
and cannot be directly
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IRQ0 System timer
IRQ1 Keyboard controller
IRQ2 Interrupt controller (enables IRQ8 through IRQ15)
IRQ3
and
IRQ4
Serial ports
IRQ5 Available
IRQ6 Diskette drive interface
IRQ7 Parallel port
IRQ8 RTC
IRQ9 Available if ACPI is set to Off in System Setup program
IRQ10 Available
IRQ11 Available
IRQ12 Mouse controller
IRQ13 Math coprocessor
IRQ14 Primary EIDE interface
IRQ15 Secondary EIDE interface
NOTE: For the full name of an abbreviation or acronym used in the table, see the
Glossary.
23205BK0.BK : 23205AB0.FM Page 17 Wednesday, March 18, 1998 1:51 PM
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