pcmhacking.net

There's probably a better place to ask but this is the only site I know with knowledgeable people. I'm working on a old nippondenso ECU from a honda cx500 motorcycle that runs a 2716 EPROM with 2K memory. IF I'm able to find and modify the fuel tables will I need to calculate and store the checksum assuming there is one? Do all EPROMs have a checksum? Is it in standard location?

Sums tend to be at the start or the end of the data, but there is no standard. For a generation of ecus from the same manufacturer things tend to carry over, though. If you have the ability to edit the data i'd say first try it and see what happens. That should give you an idea if there is something else you need to look for.

Right on. Thanks. I wish I could get a second revision of the bin... seeing differences would help. I'll give it a shot and see what up.