public _BOX_MASKS
_BOX_MASKS label word
	dw   8888h,     0h,  2222h,     0h
	dw   8888h,  4444h,  2222h,  1111h
	dw  0AAAAh,  4444h, 0AAAAh,  1111h
	dw  0AAAAh,  4444h, 0AAAAh,  5555h
	dw  0FFFFh, 0FFFFh, 0FFFFh, 0FFFFh