Interrupt 21h
Function 4Ah Modify Allocated Memory Blocks (SETBLOCK)
Expand or shrink memory for a program
entry AH 4AH
BX new size in 16 byte paragraphs
ES segment address of block to change
return CF clear nothing
set AX error code (7, 8, 9)
or BX max number paragraphs available
note 1) Max number paragraphs availible is returned only if the call fails
2) Memory can be expanded only if there is memory availible
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