>My vendors also keep asking me for a checksum for PICs.  Since
>there are many ways to calculate checksums, it's pretty hard
>to figure out what they want.  They don't know either:  their
>programmer s/w just gives them a bunch of hex digits as a
>checksum and they don't know how it was calculated.

MPLAB does seem to use the method that seems to have become a defacto
standard for programmers. I would suggest you quote the checksum that MPLAB
gives you, and then let them see if it matches what they get. If it doesn't,
then start trying to find out the method.

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