https://www.ardent-tool.com/complex/T4_Y.html#Q_vs_Y
Additionally, a 10-bit bus switch (U76) and a discrete diode (CR4) were
added to create a level-shifter for the few non-C5C'/C8C' CPU inputs
signals. This was necessary because the I/O is no longer 5 V-tolerant on
the P54C CPUs.
Is that a Hurst shifter? Zero to sixty in how many seconds?
Drifting video to come?
10 external CPU input signals
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