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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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IRQ0	System timer
IRQ1	Keyboard controller
IRQ2	Interrupt controller (enables IRQ8 through IRQ15)
IRQ3	Serial ports (if enabled in System Setup program)
and
IRQ4
IRQ5	Available
IRQ6	Diskette drive interface
IRQ7	Parallel port (if enabled in System Setup program)
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 (if enabled in System Setup
	program)
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.

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Amicroprocessor 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 addressed by MS-DOS–based programs without the aid of some special memory- managing software.

Hardware Configuration Features B-17