That feeling when you are a long time software guy, assuming computers are binary at the core (+ and - voltage), learning about the "tri state" of logic circuits. (it's when a circuit is disconnected aka high impedance)
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When we dusted off the P54C to use as Larrabee's core, there was an initial multi-week effort to convert all the tri-state logic to conventional binary because the fab said "we don't do that any more".
Good to know! So much more for me to learn in this regard.
