R W V n a13*a14=x pc4=0 pc5=0 R R R x all ram a13*a14=1 pc4=1 pc5=0 E R R x primapovana eprom, adresa e000-efff a13*a14=0 pc4=1 pc5=0 R R R x primapovana eprom, adresa 0000-ffff a13*a14=x pc4=x pc5=1 E R x x all rom R=ram E=eprom x=nic