KP915GV Product Manual
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A.5 ISA Interrupt Allocation
While the motherboard does not include an ISA bus, it includes an ISA-compatible interrupt
controller (PIC) in order to be compatible with AT standard architecture. The interrupts are
allocated as described in the next table.
Table 12. ISA Interrupt Allocation
Interrupt Description
IRQ0 System Timer
IRQ1 Keyboard Controller
IRQ2 Cascade interrupt
IRQ3 COM2, COM1 or unassigned
IRQ4 COM1, COM2 or unassigned
IRQ5 Parallel port or unassigned
IRQ6 Floppy
IRQ7 Printer port or unassigned
IRQ8 Real time clock/CMOS RAM
IRQ9 ACPI SCI (when configured for ACPI operating system)
IRQ10 Unassigned
IRQ11 Unassigned
IRQ12 PS/2 mouse or unassigned
IRQ13 Floating point unit
IRQ14 Primary IDE or unassigned
IRQ15 Secondary IDE or unassigned
NMI PCI PERR and SERR signals
A.6 ISA DMA Channel Allocation
While the motherboard does not support an ISA bus, it includes an ISA-compatible DMA controller
in order to be compatible with AT standard architecture. The DMA channels are allocated as
described in the next table.
Table 13. ISA DMA Channel Allocation
DMA Channel Description
Channel 0 Unassigned 8-bit channel
Channel 1 Unassigned 8-bit channel
Channel 2 Floppy controller or unassigned 8-bit channel
Channel 3 ECP parallel port or unassigned 8-bit channel
Channel 4 Cascade channel
Channel 5 Unassigned 16-bit channel
Channel 6 Unassigned 16-bit channel
Channel 7 Unassigned 16-bit channel
