Dma Channel Assignment; I/O Address Map - Acer Extensa 500 Service Manual

DMA Channel Assignment

DMA Channel
DRQ0
DRQ1
DRQ2
DRQ3
DRQ4
DRQ5
DRQ6
DRQ7

I/O Address Map

I/O Address
000-00F
020-021
040-043
060, 064
061
040B
061
070-071
080-08F
0A0-0A1
0C0-0DF
0F0-0FF
120-13F
180-18F
170-177
1F0-1F7
220-22F
240-24F
278-27F
2E8-2EF
2F8-2FF
378, 37A
18
Audio(optional)
ECP or Audio(optional)
Floppy
ECP(optional)
DMA controller
Not used
Not used
Audio
DMA controller-1
Interrupt controller-1
Timer 1
Keyboard controller 8742 chip select
System speaker out
DMA controller-1
System speaker
Real-time clock and NMI mask
DMA page register
Interrupt controller-2
DMA controller-2
Numeric data processor
Power management controller
2nd EIDE device (CD-ROM) select
1st EIDE device (hard drive) select
Audio
Audio(optional)
Parallel port 3
LT Win modem or COM4(optional)
COM2 or LT Win modem(optional)
Parallel port 2
Function
Function
System Introduction