INT 41 - Acorn BBC Master 512 - "OSGBPB" - MULTI-BYTE GET/PUT

	AL = function
	    01h put bytes sequentially
	    02h put bytes, ignoring sequential pointer
	    03h get bytes sequentially
	    04h get bytes, ignoring sequential pointer
	    05h get media title and boot option
	    06h get current device and directory
	    07h get current library and device
	    08h search directory
	DS:BX -> control block (see #03199)
Return: CF clear if successful
	CF set on error
	AL = 00h if operation attempted
	AL unchanged if unsupported function
SeeAlso: INT 40"Acorn",INT 42"Acorn",INT 43"Acorn"