Int D4 Fn 12 - PC-mos/386 V3.0+ - Free Native Mode Memory Block [O]
AH = 12h
ES = selector for block to free
Return: CF clear if successful
CF set on error
AX = error code (see INT 21/AH=59h)
See Also: AH=10h,AH=11h,AH=13h,INT 38
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