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When installing expansion cards it is the first (bottom)
Mbyte of address space that is of most interest. The
following diagram shows how the bottom 1M of address
space is used in a XEN-LS II. Diagrams like these are
called memory maps, and are a convenient way of
representing processor address space.
Note
The top location of this first Mbyte is 1M-1 or FFFFFh. This
is because in the first Mbyte there are 1M locations,
starting at 0. Location 1M is the start of the second Mbyte
of address space.
The memory map above shows the uses of the first Mbyte
of address space. The memory map is arranged in this way
in order to be compatible with the ISA standard.
60
1M-1
BIOS
960K
SETUP/OPTION ROM
896K
EXPANSION CARD ROM
800K
VIDEO BIOS
768K
VIDEO MEMORY
640K
DOS
0
FFFFFh
F0000h
E0000h
C8000h
C0000h
A0000h
00000h
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