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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 Available
IRQ3 COM2
IRQ11 Available
IRQ4 COM1
IRQ12 PS2 mouse
IRQ5 Available
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
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