I have what is marked as an R65C51P2. I currently have a 1.8432Mhz oscillator can hooked up to pin 7, XTALO. This has been working. But when I was drafting a small PCB to make the circuit permanent, I rechecked which pin this should be and all the literature says to use pin 6, XTALI. When I switch my wire to this pin, nothing works anymore! Is there any reasonable explanation for this discrepancy?

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

I've always used a crystal with the 6551 (and 65C51) which works fine. By driving the output with a can oscillator, I suppose there's an outside chance that the internal inverter (or whatever drives the output) got fried. The simplest test would be to try a crystal and the 20pf cap from the input to ground. Note: some 65C51 chips might require a 1meg resistor in parallel with the crystal.

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Regards, KM
https://github.com/floobydust

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

I swapped out the current chip for an identical one and pin 6 works on it, so the theory I might have burnt out the first seems possible, though strange that it would accept the input on 7 afterwards. Thank everyone!