EPROM Checksum

Posts: 2
Joined: Sat Oct 26, 2019 1:06 am

EPROM Checksum

Postby fuelish » Wed Jul 29, 2020 8:49 am

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?

Site Admin
User avatar
Posts: 6318
Joined: Sat Feb 28, 2009 8:34 pm

Re: EPROM Checksum

Postby antus » Wed Jul 29, 2020 8:56 am

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.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

Posts: 2
Joined: Sat Oct 26, 2019 1:06 am

Re: EPROM Checksum

Postby fuelish » Wed Jul 29, 2020 1:07 pm

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.

Return to Disassembly and Reassembly

Who is online

Users browsing this forum: No registered users and 1 guest