Ok, Ive got this 75% figured out. Im installing a 27mhz tent clock in my HD841. With Guidos help I have figured most of this out. His clock has three outputs, 2 of which are going to be used to bypass a gate circuit. The third is for the input of the main decoder chip which is the image attached. Can someone tell me which is the input of the decoder? I replaced the 22pf caps with 10k resistors and measured ~0v on pins 143/144 and 3.3v on pin 142. I think this means 143/144 are the inputs, but would like someone who knows to back that up.
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