mgridsize	equ	15	;15
mgrid2z		equ	512	; z dist where dots go to 2 dots
mgridshift	equ	8	; grid size
mgridwidth	equ	1<<mgridshift
mgridand	equ	mgridwidth-1
mgrcolshift	equ	1
mgrcoland	equ	(1<<mgrcolshift)-1