Hello,

Can anyone explain the syntax of a .HEX-file, which is created by MPASM
(v1.40) during compiling (actually assembling)? A single line in the
file looks roughly like this :

:AAAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBCC

I think the meaning of each line-part is :

AAAAAAAA = some kind of offset /address
BBBBBBBB = actual object-code
CC       = some kind of checksum

I specifically need to know how CC is calculated because i need to
program a couple of hundred 12c508-OTP's for a project where the
object-code for every PIC needs to be slightly different. I found the
instruction that i need to modify in the HEX-file, but i don't know how
to re-calculate the checksum.

PS. What happens if I change the code, do not re-calculate the checksum
and just program a pic ?

Max Dekkers (mdekkers@inter.nl.net)