Eprom checksum

Working on a Midway grid. Board is reporting bad checksums on some roms.
The roms have checksums written on them (factory labels with handwritten
info).

Put a rom into my EMP20 (which I have never used for this size rom before)
and then had it calc the checksum. Doesn't match the notation on the label.

Loaded a mame rom set into the software and got a different checksum from
both my rom and the file.

Doing a file compare against the rom loaded into the buffer and the rom in
the socket shows dramatic differences.

I tried this with one of the roms that the board is reporting as good and
got the same kind of results.

So now I don't know what to trust.

I wanted to calc the checksums of the mame rom images but can't figure out
what tool to use (running windows here).

Any help appreciated.

David

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Received on Sun Mar 31 22:15:21 2013