' ' , ', , ' . ' IBM PC XT 8088 1 ' (20 ). , - 640 ( ). ' ' (Conventional memory). 640 ( 0...9FFFF) MS DOS .
1024 ( 0...3FF) (Interrupt Vectors) ' 256 , . , - '.
4004FF BIOS (BIOS Data Area). BIOS .
5009FFFF DOS (DOS Area) ' (User RAM).
1 ' 384 ( A0000FFFFF), , UMA (Upper Memory Area) - ' UMB (Upper Memory Blocks) - ' High DOS Memory.
' ( A0000BFFFF) .
' E0000FFFFF ' ' ROM BIOS.
64 (page frame) D0000DFFFF, () ' (Expanded memory) ' 32 , 1 '. 16 ' . ' . , ' , , ' "" 64 . .
' 0000...DFFFF ', '.
1 (.). ' IBM PC .
7.3
' ' ' ' 1 ' (Extended memory). . ' ' ' ( ') 16 (24 ) 4 (32 ).
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