Chapter
4 -
Programming
FEOOOO-FFFFFF
System BIOS
128K
400000-FDFFFF
1/0 Memory
12160K
100000-3FFFFF
DRAM
3072K
OFOOOO-OFFFFF
System BIOS
64K
OEOOOO-OEFFFF
Real Mode Wndow I Extended BIOS 11/0
64K
ODOOOO-ODFFFF
Extended BIOS I 110
64K
OCBOOO-OCFFFF
User Area
32K
OCOOOO-OC7FFF
VGA BIOS
32K
OAOOOO-OBFFFF
VGA DRAM Memory
128K
00000O-09FFFF
DRAM
640K
Figure 4-3. 4 Mbyte Memory Map (as seen by the CPU)
4-4
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