On 18/07/2017 8:26 PM, Carlos Camacho wrote: > inferior cpu to superior cpu was doable > > superior cpu to inferior cpu was a big pain in the neck (requiring much > more code and sacrifices of chickens) In this case, 6502->6809 is certainly doable, whether or not it's an example of the former case. Regards, -- Mark McDougall <http://retroports.blogspot.com.au>