Don't let your old computer be destroyed to harvest its raw materials. At least not before contacting someone who might like to preserve it and keep it in working condition.
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There are many collectors of "vintage" or "retro" computers. Before you contact an electronics recycling company that says they'll offer you BIG $$$ for your old computer, please consider contacting one of us collectors instead.
There are many of us collectors who would be happy to pick up or otherwise offer advice as to what you might do with your old computer.
Re-use is better than recycle!