Hi Joerg, Thank you. PO2013 is also about new tricks. How about running `Display.Mod' in support for both modes. MODULE Display; ... BEGIN IF SW[6] THEN dpt := 4 (*4 bit*) ELSE dpt := 1 (*1 bit*) END ; ppw := 32 DIV dpt; (*pixels per word*) bpl := dpt * 128 (*bytes per line*) END Display. -- Tomas Kral <thomas.kral at email.cz>