Scopetris demo

recursive gravity!

worst tetris player ever

Keep watching, dude.

No, it was a regular raster display computer, around 1988.

I suppose you should make the beam 'rest' either out of the display area or make it zig zag somewhere to stop phosphor burn in!

There are a few things you can do. The best one is probably to have an "object buffer" and just keep scanning all the objects on screen out constantly, independent of the game framerate. It's not 100% compatible with "fake intensity control" (the intensity ends up being dependent on the number of objects onscreen) but it avoids bright spots / burn-in and also prevents DC offset problems :)

So it's not done by voltage levels and frequency, it's done by drawing lines between co-ordinates like any other vector monitor? I guess you are talking directly to the monitor and not plugging your output into the voltage inputs used to use the machine as a scope, right?

No, it IS done by voltage levels, channel 1 and channel 2 standard voltage inputs on the oscilloscope is all I use. When the scope is in X/Y mode (any scope can do that, no modification necessary) the voltages control the beam X and Y directly. Keep in mind this is an old analogue oscilloscope which is actually just a vector screen with extra electronics (but without intensity control). Clear?