Acer 270 manual Mechanical Specification, Memory Address Map, I/O Address Map, IRQ Assignment Map

Mechanical Specification

Item	Specification
Switch	Power switch
	Lid switch
	Internet switch
	Wireless ON/OFF switch
	E-mail switch

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	Video Controller
3C0-3DF
3F0h-3F7	Standard Floppy Disk Controller
3F0-3F7	Floppy disk controller
480-48F, 4D6	DMA controller-1
4D0-4D1	PCI configuration register
CF8-CFF
IRQ Assignment Map
Interrupt Channel	Function(Hardware)
IRQ00	System timer
IRQ01	Keyboard
IRQ02	Programmable Interrup Controller
IRQ03	Free by default or Generic

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