Link for the lazy: http://en.wikipedia.org/wiki/Williams_tube http://en.wikipedia.org/wiki/Williams_tube Note for the kids: Yes, that's right, it says CRT memo

Link for the lazy: http://en.wikipedia.org/wiki/Williams_tube http://en.wikipedia.org/wiki/Williams_tube Note for the kids: Yes, that's right, it says CRT memory. That's the same Cathode Ray Tube as found in non-flat-panel TVs and monitors, except we're using it as a high speed storage device. Ironically, the wikipedia page for Selectron tubes actually has more useful information on Williams tubes than it's article does... http://en.wikipedia.org/wiki/Selectron_tube http://en.wikipedia.org/wiki/Selectron_tube