In theory it is possible to do a custom PC board that is software compatible with MS
just for the rotary. We don't need peak and hold injector driver because as far as I
know Mazda never used them.  The other thing we don't need is high current, old
fashion, coil drivers. Modern coils like the LS1 and RX8 coils have built in drivers.
The computer can trigger these directly. That will simplify the board greatly.

Here is the pin outs for the MS 68HC908 and as preliminary new schematic.
I will keep the port assignments the same so the new board will be sofware
compatible. Some of the other circuitry will be copied for the curret MS board.


Paul Lamar
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