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

Look at the ms3x. All this has already been done.

chris smale

http://www.ms3efi.com/product2.html

I see something here with more over kill for our purposes. Suffers from feature-its
:) It is probably programed in C as well so no useful 68 asm source code from my
point of view.

Ed Carver brought by a couple of MS3 with daughter cards today. Thanks Ed.
Apparently they are program in C as well. IMHO Megasquirt is diverging from keep it
simple. I'll try to go back as far as possible.

I am a simple man :)



Paul Lamar
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