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AcerAltos 19000 User’s GuideA-2
A.2 I/O Address Map
Table A-2 System I/O Address Map
Address Range (hex) Device
000 ~ 01F DMA controller 1
020 ~ 027 Interrupt controller 1
030 ~ 037 Interrupt controller 1
040 ~ 047 System timer
050 ~ 057 System timer
060 ~ 06F Keyboard controller
070 ~ 07F Real-time clock, NMI mask
080 ~ 09F DMA page register/speed status register
0A0 ~ 0BF Interrupt controller 2
0C0 ~ 0DF DMA controller 2
0F0 Clear math coprocessor
0F1 Reset math coprocessor
0F8 ~ 0FF Math coprocessor
4F0
AEN4 enables (onboard VGA enabled)
Flash ROM programming
IRQ12 enabled
3.5-inch diskette 3 -mode selection
DMA channel 1 selection
DMA channel 3 selection
4F1 ASM data read/write port
4F2 ASM index write port
0CF8 PCI configuration address regulation