I actually owned a C-one, DTV and now a Chameleon. The Jeri C-one core was never complete enough to run much software. The DTV core, although very nice was never a good replacement for a real 64. It really was its own platform with some c64 compatibility. Until the FPGA64 core came out by Peter Wendrich that ran on the C-one there was almost NOTHING to run on the c-one that ran c64 software decently. The FPGA64 core later was turned into the Turbo Chameleon cartridge which runs with a C64 and in a standalone mode. At this point, it is the closest we have to a C64 clone that really is getting all the little things right that make it hard to get high compatibility! Each release is getting better and better and it has taken YEARS to get that far.