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Hardware Configuration Features B-17
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
addressed by MS-DOS–based programs without the aid of some special memory-
managing software.
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IRQ0 System timer
IRQ1 Keyboard controller
IRQ2 Interrupt controller (enables IRQ8 through IRQ15)
IRQ3
and
IRQ4
Serial ports (if enabled in System Setup program)
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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