Re: Control-C, etc
Some time back I worked on a Computest unit, I mentioned it here. One puzzle I had was that the reset key (which like other machines of a similar vintage provides a hardware reset to the processor) seemed to do nothing.
It turned out there's a bit of logic on the keyboard PCB includng a monostable with a period of a couple of seconds. You have to hold the reset key down until the monostable times out for there to be a reset. Release it before that and nothing happens. This struck me as a rather neat way to protect against accidentally hitting the reset key.
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