It's actually pretty easy to port C64 software - both Assembly and BASIC. It uses the exact same BASIC and same processor family as the Commodore 64, NES, Apple

It's actually pretty easy to port C64 software - both Assembly and BASIC. It uses the exact same BASIC and same processor family as the Commodore 64, NES, Apple II and many others. Memory map, graphics and sound are the biggest challenges in porting because those are different. But code to translate between these will get better and better. Lots of ports from other systems already.