BIOS Setup
EC3-1813CLD2NA(CHENGDU)
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3.4 System Resource Managed by BIOS under X86 Platform
We define three kinds of system resources here: I/O port address, IRQ interrupt
number and DMA number.
DAM
Level
Function
DMA0 DRAM
refresh
DMA1
Unassigned
DMA2
Unassigned
DMA3 Unassigned
(sometimes used for HDD)
DMA4
Used for DMAC cascade
DMA5 Unassigned
DMA6 Unassigned
DMA7 Unassigned
APIC
Advanced programmable interrupt controller. Most motherboards above P4 level
support APIC and provide more than 16 interrupt sources, like IR0