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I've been getting some home-made ZX Spectrum programs off cassettes that have been various lofts for decades. Amazingly, most still load. See github.com/blogmywiki/ZXSpectrum for files you can load in emulators.
Assembled and running my PongClock.prc (which you can find here)
The program includes logic which disables the auto-off feature if it finds 2.75V or greater at startup.
This is my second PalmOS program, I wrote CountDown more than 10 years ago. Writing this one in 2010 wasn't easy, it may count as Retrocomputing. The tools I used back then were lost. I ended up using a Metrowerks CodeWarrier Lite I still had on CD. It won't even install on my new (Windows 7) laptop.
IBM PS/2 E, rear view of the unit with the available connector and the rear two pcmcia slot for expansion.
One of the rats nests in the back of the console. See the magic switch? Adding 2dF involved a new topend, which wasn't foreseen in the design of the telescope, so the old computer control needs to be told about the topend manually instead of detecting it itself.