Reference
Real Mode PC Memory Map

10FFF 
Extended Memory (XMS)
 ?????
10000 
High Memory Area (HMA) - 64K
 10FFE
F800 
System BIOS ROM - 32K
 FFFF
F000 
System BIOS ROM or UMBs - 32K
 F7FF
C800 
ROM, UMBs, or EMS Page Frame
160K
 EFFF
C000 
Video ROM - 32K
 C7FF
A000 
Video RAM
128K
 BFFF
0050 
Conventional Memory
639K
 9FFF
0040 
BIOS Data Area - 256 Bytes
 004F
0000 
Interrupt Vector Table - 1K
 003F

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