Ahplabs.352 net.games utzoo!decvax!cca!hplabs!hansen@sri-unix Wed Apr 28 09:10:31 1982 Re: The straight poop Beam-penetration tubes have expensive deflection circuitry (because the beam deflection varies with the changing electron velocity) and provide a limited range of colors. Think about it. How can you turn on the second layer without turning on the first? With these two factors, it would be hard to believe that Atari would use such a system. No, shadow-mask tubes must be the only answer. Craig Hansen HP Labs