INT 33 - MS MOUSE v7.0+ - ENUMERATE VIDEO MODES                                 
	AX = 0029h
	CX = previous video mode
	    0000h get first supported video mode
	    other get next supported mode after mode CX
Return: CX = first/next video mode (0000h = no more video modes)
	DS:DX -> description of video mode or 0000h:0000h if none
Notes:	the enumerated video modes may be in any order and may repeat
	the description string (if available) is terminated by '$' followed by
	  a NUL byte
SeeAlso: AX=0028h