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Chapter 1 33
Memory Address Map
Memory Address Size Function
00100000h-000F0000h 64KB System BIOS
000CD000h-000C0000h VGA BIOS
000C0000h-000A0000h 128 KB Video memory (VRAM)
000A0000h-00000000h 640KB Conventional memory
I/O Address Map
I/O Address Function
000-00F DMA controller-1
020-021 Interrupt controller-1
040-043 Timer 1
060, 064 Keyboard controller 38859 chip select
061 System speaker out
040B DMA controller-1
061 System speaker
070-071 Real-time clock and NMI mask
080-08F DMA page register
0A0-0A1 Interrupt controller-2
0C0-0DF DMA controller-2
0F0-0FF Numeric data processor
170-177 2nd EIDE device (CD-ROM) select
1F0-1F7 1st EIDE device (hard drive) select
220-22F Audio
240-24F Audio (optional)
278-27F Parallel port 3
378,37A Paraller port 1
3B0-3BB
3C0-3DF
Video Controller
3F0h-3F7 Standard Floppy Disk Controller
3F0-3F7 Floppy disk controller
480-48F, 4D6 DMA controller-1
4D0-4D1
CF8-CFF
PCI configuration register
IRQ Assignment Map
Interrupt Channel Function(Hardware)
IRQ00 System timer
IRQ01 Keyboard
IRQ02 Programmable Interrup Controller
IRQ03 FIR
IRQ04 Communications Port (COM1)
IRQ05 Free
IRQ06 Standard Floppy Disk Controller
IRQ07 Free
IRQ08 Real Time Clock
IRQ09 ACPI Compliment System
IRQ10 SMBUS Controller
IRQ11 Free