<nostalgia>When I took a class on digital electronics, our professor could buy lots of 50 for about $20USD. We built little Von-Neumann style machines with about 512 bytes of memory, and we made them into oscilloscope graphics generators, morse-code signal processors, etc. It's the best way to learn about the lowest level of a computer- build one. If you can afford a breadboard, some wire, a Z-80, some breadboard-style RAM, and some logic chips, you'll never regret playing around with it. </nostalgia>
I don't know about arcade games, but the Z-80 was the processor in the original Gameboy (which feels like a long time ago . . .). And of course, some of the TI calculators. The Z-80 has one huge advantage going for it- it's asm is clean and simple. We may never see another chip this easy to program for ever again.
The more I watch, the more I learn ---
If you set yourself on fire, the world will pay to watch you burn.
--- Course of Empire
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