Hardware Configurat i on Features B-17

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P roblems c an arise if tw o de vice s at temp t to use the s ame IRQ l ine. To a void this type
of conflict, check the documentation for the default IRQ line setting for each installed
dev ice. T hen consult Table B-9 to configure ea c h de vice f or one of the a vaila ble 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 processor and programs operating under MS-DOS (real-mode operation) can
address only 1 megabyte (MB) (1024 kilobytes [KB]) of system memory. This area is
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 co proc es so r
IRQ14 Primary EIDE interface (if Enabled in System Setup pro-
gram)
IRQ15 Secondary EIDE interface (if Enabled in System Setup
program)
NOTE: For the full name of an abbreviation or acronym used in the table, see the
Glossary.