>The next question is whether these opcodes do anything interesting. Of course they do. Say, back in 1986 a videogame (Lunolet-4?) used the screen to show the

>The next question is whether these opcodes do anything interesting. Of course they do. Say, back in 1986 a videogame (Lunolet-4?) used the screen to show the position of the spacecraft between the Earth and the Moon like this: "E L-" - the spacecraft is behind the Moon, "E -L " - the spacecraft between the Earth and the Moon.