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pinout that I found for 68HC09 seems significantly different from that shown for 16021633 here:
https://pcmhacking.net/ludis/c3pinouts.html#16021633
closest match that I have seen so far from pinout point of view is 6800, but even that has a few differences.
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Well, then, it looks like 6802. I have an old CoCo2 / TRS80 manual from the '80s, and at one point in the 6809 machine code section I'd penned in "Same processor as GM computer." Maybe not so much...
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I'm not convinced that it is a 6802 either :(
Looking at the PCB, pin #5 is connected to pin #1 (which is ground).
However, pin #5 is an output ('VMA') according to the 6802 datasheet.
So unless Delco are in the habit of connecting outputs to ground, I guess it must be something other than a 6802.
Confused.