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5.2 Memory Space
A0000
C0000
D0000
E0000
100000
(1MB)
BF80 0000
1 0000 0000
4 3E7F FFFF
(Up to16.9GB)
(*1) The size of the video BIOS may change in future versions.
(*2) The extended BIOS space is a narrow space between D0000 and DFFFF and may already be in use by
other devices. In addition, the size of the BIOS of standard built-in adapters may change in future
versions. It is advisable that you do not use the extended BIOS space if at all possible when you design
a new device. If you do, a contention may occur between devices and malfunctions of the devices may
result.
0
Conventional memory
500
(DOS application area)
Video RAM window
Video BIOS (*1)
Extended BIOS space (*2)
System BIOS
(Flash ROM)
Main memory
Memory-mapped I/O
Main memory
Space available for real mode.
5-7
5. SPECIFICATION
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