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You can turn those ancient computers with serial ports into test equipment, like for example a poor-man's logic analyzer to inspect the timing of digital signals like encoder pulses. Or DIO set by tasks to inspect scheduling timing and jitter.
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I recently turned an old PCI-X sound card I had in an old gateway into a low-voltage oscilloscope and it happens to have a built in mic input and radio antenna so I can analyze radio and sound frequency as well (if I ever have the time to really muck around with it). I have never actually used a serial port for anything so my lack of familiarity could be a bit of a hindrance as far as creating makeshift equipment is concerned, but maybe over the summer...