Then this information will be useful to you. It is northstar ignition system trigger wheel at the exact size and configuration for 10* btdc base timing.
https://www.thirdgen.org/forums/atta...thstar-dim.pdf
this is the northstar ignition system patent.
https://www.thirdgen.org/forums/atta...dis_patent.pdf
so, I think I was right in thinking they used an eprom as a custom signal generator that is synched and clocked to the optispark signal.
Easiest way I can think of to produce a complex waveform cheaply.
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