Chapter 3 BIOS Setup
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CPC-1817CLD5NA
DMA
Level
Function
DMA0 COM2
DMA1 Unassigned
DMA2 FDD
Controller
DMA3 Unassigned
DMA4
Cascade used by DMAC
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 IRQ16 - IRQ23; while
some others can have up to 28 interrupt sources, such as motherboard supporting
PCI-X. However, relevant OS are required to enable that function, and currently, only
the OS above Windows 2000 could support that function.
IO Port Address
Only 16 IO address lines are designed for X86, from 0 ~ 0FFFFh; there is 64K for the
system I/O address space. In traditional ISA connector, only the foregoing 1024 (0000
~ 03FFh) are adopted while the ports above 0400h are adopted by PCI and EISA
connectors. Each peripheral will occupy portion of the space. The table below shows
parts of the I/O connectors used in X86 platform.
Address
Device Description
000h - 000Fh
DMA Controller #1
020h - 021h
Programmable Interrupt Controller #1
Содержание CPC-1817CLD5NA
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