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Some early computers used a membrane keyboard (ZX80, ZX81, Atari 400), or semi-membrane with minimal keys (ZX Spectrum). This is because it was cheaper than a mechanical keyboard. Intuitively I would ...
I've been cleaning up an Atari 400 that had a bad RF cable, and cleaned the machine thoroughly so it's looking great. It's working well apart from the keyboard, where most of the keys aren't working: ...