6
ADDRESS
SIZE
FUNCTION
000000 -
09FFFF
640KB
640KB Base Memory
0A0000 -
0BFFFF
128KB
Video RAM
0C0000 -
0CFFFF
64KB
VGA BIOS
0D0000 -
0DFFFF
64KB
Reserved
0E0000 -
0EFFFF
64KB
System BIOS for SCU,
PCI, PnP, PMU
0F0000 -
0FFFFF
64KB
System BIOS for Kernal
100000 -
16MB to 256MB
Extended Memory
System Memory 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
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
Maps
I/O Address Map
