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Configuration
CP307
Page 4 - 6
ID 34424, Rev. 3.0
P R E L I M I N A R Y
4.4
Memory Map
The CP307 board uses the standard AT ISA memory map.
4.4.1
Memory Map for the 1st Megabyte
The following table sets out the memory map for the first megabyte:
Table 4-4: Memory Map for the 1st Megabyte
MEMORY RANGE
SIZE
FUNCTION
0xE0000 – 0xFFFFF
128 k
BIOS implemented in FWH
Reset vector 0xFFFF0
0xD0000 – 0xDFFFF
64 k
Free
0xCF000 – 0xCFFFF
4 k
Free
0xC0000 – 0xCEFFF
60 k
VGA BIOS
0xA0000 – 0xBFFFF
128 k
Normally used as video RAM as follows:
CGA video: 0xB8000-0xBFFFF
Monochrome video: 0xB0000-0xB7FFF
EGA/VGA video: 0xA0000-0xAFFFF
0x000000 – 0x9FFFF
640 k
DOS reserved memory space
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