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System Memory Map
Memory is mapped by the memory controller registers.
Figure 2-10 on page 2-17 shows the memory map for a correctly
functioning system. Memory can be mapped differently if POST
detects an error in system board memory or RT/CMOS RAM. In the
figure, the variable
x
represents the number of 1 MB blocks of
system board memory starting at or above the hex 100000 boundary.
Figure 2-10. System Memory Map
Hex Address Range Function
00000000 to 0009FFFF 640 KB system board RAM
000A0000 to 000BFFFF Video RAM
000C0000 to 000C9FFF System board video BIOS ROM mapped to
RAM
000C8000 to 000EFFFF Channel ROM
000F0000 to 000FFFFF 64 KB system board ROM mapped to RAM
00100000 to (00100000 +
x
MB)
x
MB system board RAM
FFFF0000 to FFFFFFFF 64 KB system board ROM
(same as 000F0000 to 000FFFFF)
System Board 2-17