I don't understand why you don't have the source code if it was developed for you or your company. If the company paid for its development, it should have the source code. Did the company not think that the source code was important, did the original programmer steal the source code, or did you lose it?
If it was developed on contract, I would contact the developer and either ask for him to make the change for a fee, or ask for a copy of the source code, which should have been provided.
It the developer was working as an employee, that probably won't work.
Does that mean that the program loaded without error? Can you verify that?
It is possible that the program itself does a checksum on the code to verify the integrity. If so, I expect that there would be some documented error response to that occurrence. It might just refuse to run at all, though.
What do you mean by "tryed disassembler etc. no chance"? Disassemblers work.
You may need to hire a professional to help you with this one.
Hallo Wolfgang - I can help you if you willing to pay for it. Please respond to my private email address otc snipped-for-privacy@gmx.net for further discussion. I'm a experienced disassembler for 8051, 68000 code. It should be no problem. (Possible to communicate in German language) Regards - Henry
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