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74HC(T)14
When cleaning up the design you should also consider replacing the 74HC(T)14 by a 74HC(T)04.
Schmitt-Triggers are a really bad idea in Pierce-Oscillators. My ZX81+38 did not work until I used a 74HCT04. The oscillator output was ANYTHING from several 100 kHz, 1.3 MHz, 6.xx MHz etc., but the desired clean 13 MHz signal, no matter what 13 MHz-XTAL I used (had a couple of them from different sources).
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