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by mnw21cam
2116 days ago
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Way back when computer to computer serial connections were a thing, you could get a cable that erroneously connected the power as well as the signal. Even if the two computers had the same ground, if the voltage regulator of one computer's power supply was slightly higher voltage than the other one, then it would try to power both computers, with the power flowing through the cable. This would tend to break either the cable, or the power supply. This particular thing shouldn't be a problem with USB, as the power supply has protection circuitry. |
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