Acer 270 User Manual
Page 40
Chapter 1
35
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
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
Free by default or Generic
Mechanical Specification
Item
Specification
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