Personal Computer User Manual

AR-B1851 User’s Guide
AR-B1851
41
IRQ Mapping Chart
IRQ0(ISA) System Timer IRQ15(ISA)
Secondary IDE
IRQ1(ISA) Keyboard IRQ9(PCI) SMBus
IRQ3(ISA) COM2 IRQ16(PCI) USB Universal
IRQ4(ISA) COM1 IRQ16(PCI) Graphics
IRQ8(ISA) System CMOS/RTC IRQ17(PCI) AC’97
IRQ9I(ISA) ACPI-Compliant IRQ18(PCI) USB Universal
IRQ10(ISA) COM4 IRQ19(PCI) USB Universal
IRQ11(ISA) COM3 IRQ20(PCI) Network #2
IRQ12(ISA) Mouse IRQ21(PCI) Network
IRQ13(ISA) Math Coprocessor IRQ23(PCI) USB2 Enhanced
IRQ14(ISA) Primary IDE
DMA Channel Assignments
CHANNEL FUNCTION
0 Available
1 Available
2 Available
3 Available
4 Cascade for DMA controller 1
5 Available
6 Available
7 Available