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51
1st MB Memory Address Map
Memory address
Description
00000-9FFFF System
memory
A0000-BFFFF VGA
buffer
C0000-C7FFF VGA
BIOS
F0000-FFFFF System
BIOS
1000000- Extend
BIOS
*Default setting
IRQ Mapping Table
IRQ0
System Timer
IRQ8
RTC clock
IRQ1 Keyboard
IRQ9 Available
IRQ2
Cascade to IRQ Controller
IRQ10
Intel 82562ET LAN
IRQ3
COM2
IRQ11
Video IN Device
IRQ4 COM1
IRQ12 PS/2
mouse
IRQ5 Audio
Device
IRQ13 FPU
IRQ6 FDC
IRQ14 Primary
IDE
IRQ7 Printer
IRQ15 Secondary
IDE
DMA Channel Assignments
Channel
Function
0
Available
1
Available
2
Floppy disk ( 8-bit transfer )
3
Available
4
Cascade for DMA controller 1
5
Available
6
Available
7
Available