INT 21 - Phar Lap 386/DOS-Ext VMM v2.3+ - SET SIZE OF BUFFER FOR DOS CALLS

	AX = 2530h
	ECX = size of data buffer in bytes (1024 to 65536)
Return: CF clear if successful
	CF set on error
	    EAX = error code
		08h insufficient low memory
		81h invalid size
SeeAlso: AX=2517h