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INT 21 - European MSDOS 4.0 - "PARTITION" - GET/SET FOREGROUND PARTITION SIZE
        AH = 83h
        AL = function
            00h get size
            01h set new size
                BX = new size in paragraphs
Return: CF clear if successful
            BX = current size (function 00h) or old size (function 01h)
        CF set on error
            AX = error code (01h,07h,0Dh)(see AH=59h)
Desc:   specify or determine how much memory may be allocated by the foreground
          process
Note:   if the partition size is set to 0000h, no partition management is done
          and all memory allocation is compatible with DOS 3.2.
        the partition size can be changed regardless of what use is being made
          of the changed memory; subsequent allocations will follow the
          partition rules (foreground processes may allocate only foreground
          memory; background processes allocate background memory first, then
          foreground memory)
SeeAlso: AH=4Ah

See Also: 2148
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