I remember this. I had a demo program which did a slide show and produced some amazing colors on CGA monitors. It was a demo for some game. I kept it because it was amazing to see how someone was able to push the hardware to do things you'd never expect.

I remember years earlier how someone at my college figured a way to cause the mainframe's 1401 line printer to move the steel print head band in such a way that you could hear the printer play the 5 notes from the "Close Encounters of the Third Kind" theme.

Well, on the same page:

http://boingboing.net/2015/04/16/how-th ... -1024.html

Which is even more impressive.

I saw this the other day. The neat takeaway for me wasn't really the technique (I think a lot of people already knew that) but the fact that he was able to reproduce the effect with a bit of Java.

Also I could be wrong, but I would think this would wreak havoc on PAL games playing on an NTSC C64 and vice versa, due to refresh rates and timing and such.

I knew about this years ago, I thought everyone knew about this. Didn't everyone know about this?



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