Electronics > Repair
Rohde & SchwarzSMS/SMS2 Microprocessor Board, where is the code/firmware stored?
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RichardM:
OK, so after trying another method to dump the 8049 mask rom from https://www.eevblog.com/forum/microcontrollers/mcs-48-disassemble-8049-dump/msg3121778/#msg3121778

I managed to get a consistent rom dump. I have no idea if it is valid code. I used DASMx to disassemble and get the code attached.

Programming this into an 8749, trying this with a 7111 board in a working SMS and........ no change. Just mixed characters on the display. So, maybe there is nothing wrong with the 8049 after all? Or, the code attached is rubbish ? Anyone willing to look at the assembly attached and make an educated post that would be much appreciated :)

Cheers

Richard
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