Here's a topic which piqued my curiosity 30 years ago and has recently recaptured my interest. I have never seen anything written about it, so I'll write it now. If you have seen something before, please post it here.   One of many clever design aspects of the Atari 800 is how it addresses its RAM. At a time when adding RAM to a microcomputer involved arranging jumper blocks or switches in strange patterns laid out in cryptic instructions, Atari managed to make the task consumer-proof. And the