Guys, these ROM's are very much alike. At my first round of initial disassembly, I shocked to see how much alike the (dis)assembly really was.

There were obvious differences like the automatic transmissions specific code, etc but they share a lot in common.

 

holy slow sample rate batman!

 

The external rom board I built for myself runs about 40 samples a second @ 15 channels.. it's pretty neat.

 

Looking to build one, has anyone got a site where I can purchase the parts from?

 

For those of you who were following this thread, new insights and successes in this new thread: https://www.rx7club.com/3rd-generati...hread-1170213/

Closing this one.