Acer Extensa 900 Series Maintenance Manual page 63

Table 4-4 I/O Address Map
Address Range
000 - 00F
020 - 021
022 - 023
040 - 043
048 - 04B
060 - 06E
070 - 071
080 - 08F
0A0 - 0A1
0C0 - 0DF
178 - 17A
1F0 - 1F7
170 - 177
3F6, 3F7
220 - 22F
240 - 24F
260 - 26F
280 - 28F
278 - 27F
2E8 - 2EF
2F8 - 2FF
378 - 37A
3B4, 3B5, 3BA
3C0 - 3C5
3C6 - 3C9
3C0 - 3CF
3D0 - 3DF
3E0 - 3E1
3E8 - 3EF
3F0 - 3F7
3F8 - 3FF
CF8 - CFF
Device
DMA controller-1
Interrupt controller-1
M1523 registers
Timer 1
Timer 2
Keyboard controller
Real-time clock and NMI mask
DMA page register
Interrupt controller-2
DMA controller-2
6377 registers
Hard disk select
CD-ROM
Audio (option)
Audio (option) - default
Audio (option)
Audio (option)
Parallel port 1
COM 4
COM 2
Parallel port 2
Video subsystem
Video DAC
Enhanced graphics display
Color graphics adapter
PCMCIA controller
COM3
Floppy disk controller
COM 1
PCI configuration register
Theory of Operation 4-7