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I/O Address Map
Hex range
Device
000 - 00F
DMA controller-1
020 - 021
Interrupt controller-1
040 - 043
Timer 1
048 - 04B
Timer 2
060 - 06E
KB controller M38813 chip select
070 - 071
RTC and NMI mask
080 - 08F
DMA page register
0A0 - 0A1
Interrupt controller-2
0C0 - 0DF
DMA controller-2
1F0 - 1F7
Fixed disk select
3F6 , 3F7
2F8 - 2FF
Serial port 2
378 - 37A
Parallel port 1
3B4 , 3B5
CRT controller index (mono)
3D4 , 3D5
CRT controller index (color)
3BA
Feature control
3C0 - 3DA
3F2 - 3F7
Floppy disk controller
3F0 , 3F1
Configuration port
3F8 - 3FF
Serial port 1
System Memory Map
Address Size Function
000000 - 09FFFF 640KB 640KB Base Memory
0A0000 - 0BFFFF 128KB Video RAM
0C0000 - 0CBFFF 48KB VGA BIOS
0CC000 - 0DFFFF 80KB Reserved
0E0000 - 0EFFFF 64KB Reserved
0F0000 - 0FFFFF 64KB System BIOS for Kernel
100000 - 15MB to
127MB
Extended Memory