Well, further experimentation revealed that the chips are working, but with a quirk: If the the input of the '232 (pin 10) is tied to ground (pin 15), then the output (pin 7 of the '232, or pin 3 of J9) goes to the expected value of ~+10 volts. If, (...) (27 years ago, 1-Aug-97, to lugnet.robotics.handyboard)
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