INT 33,3 - Get Mouse Position and Button Status

	AX = 03


	on return:
	CX = horizontal (X) position  (0..639)
	DX = vertical (Y) position  (0..199)
	BX = button status:

		│F-8│7│6│5│4│3│2│1│0│  Button Status
		  │  │ │ │ │ │ │ │ └──── left button (1 = pressed)
		  │  │ │ │ │ │ │ └───── right button (1 = pressed)
		  └──┴─┴─┴─┴─┴─┴────── unused


	- values returned in CX, DX are the same regardless of video mode