After looking at Bob's files, and checking P20-22, I find that almost everything seems to be in order.
However, P23 is fine until it enters IC23, but when it exits via pins 4 and 10, I get two differing waveforms. One looks much like Bob's example of the P23 trace, basically a square wave, but the other is not the same.
I understand that the original P23 wave is being modulated by the wave coming from P16, but shouldn't the outputs on 4 and 10 look the same?
I can see the clock clearly at TP4, and as mentioned above, can see the pattern change on TP2 as I move front panel controls.
Any tips, clues, or suggestions are appreciated.
Thanks.