Count me out on venturing into PCM chip flashing in the foreseeable future. I don't have access to a chip programmer for the AV28F400B chip. My plan was to desolder / read / re-flash / solder / test / a AV28F400B chip before going further. My project budget is not very large at the moment. I might revisit this project in future, just depends on how affordable I can get a 44 pin chip programmer capable of flashing the AV28F400B chip for.

dave w