User's Manual

User’s Manual

Appendix A :System Resource

Interrupt Controller

The AW-A795 is a fully PC compatible control board, it consists of 16 ISA interrupt request

lines and most of them already in used by other part of the board. Please make sure that

the IRQs do not conflict if you would like to use extra add-on cards.

System IRQs are available to cards installed in the ISA expansion Bus first. Any

remaining IRQs then may be assigned to this PCI Bus. You are able to use the Microsoft’s

Diagnostic(MSD.EXE) utility include in Windows director to see their map.

IRQ Assignment

IRQ0 System Timer Output

IRQ1 Keyboard

IRQ2 Interrupt rerouting from IRQ8 through

IRQ15

IRQ3 Serial Port 2

IRQ4 Serial Port 1

IRQ5 USB Controller

IRQ6 Floppy Disk Controller

IRQ7 Parallel Port 1

IRQ8 Real Time Clock

IRQ9 Ethernet Controller

IRQ10 Reserved

IRQ11 USB Controller

IRQ12 Mouse

IRQ13 Math Coprocessor

IRQ14 Primary IDE Controller

IRQ15 Secondary IDE Controller

DMA Channel Assignment：Channel 4 is by default used to cascade the two

controllers

Channel Assignment

DMA0 Available fir PCI and ISA Slot

DMA1 Available for PCI And ISA Slot

DMA2 Floppy Disk Controller

DMA3 Available for PCI and ISA Slot

DMA4 Cascade