INT 31 P - CauseWay - "GetMemNear" - ALLOCATE APPLICATION-RELATIVE MEMORY
	AX = FF16h
	EBX = size in bytes of block to allocate
Return: CF clear if successful
	   ESI = application-relative linear address of allocated block
	CF set on error
SeeAlso: AX=FF17h,AX=FF18h,AX=FF19h