[sdiy] pd650 - do all the Roland applicaitons use an identical chip?

[Rainer Buchty]

> It *is* possible somehow. Somebody already did, but got carried away. 
> Instead of a simple replacement, he went overboard and completely 
> re-wrote the firmware, not only added plenty of control functions, but 
> also a character display and mo' knobs.

Are you sure that that somebody indeed read out the original program 
instead of just rewriting everything from scratch? After all, the uPD650 
has just 2kB of program memory and what the box does is rather well 
known.

Rainer