NASA still maintains some of the Voyager spacecraft code in a 1970s-era programming language that almost nobody on Earth fully understands anymore
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I've been thinking about messing around with Z80 ASM for a while with the end goal of doing interesting things with one of my old TI calculators. Finally got around to doing some googling, found this guide to the basics, and thought I'd share it for anyone else who might like to read it.