Re: Mk14 vdu
As discussed originally, just fit a resistor permanently in series with the TOP PAGE output so that if it ever does clash with an opposing output no harm will come of it. Maybe around 330R, low enough so it doesn't weaken the drive from TOP PAGE too much, but high enough to withstand 5V across it if it ends up with +5V from an output on one end and 0V from another output on the other.
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