Daniël Mantione has developed a modern version of the Final Cartridge III. The Final Cartridge III 101% is a flashable cartridge that allows you to install your own firmware on the cartridge. The improvements are: Boots to BASIC. REU registers free to use. Fastloader 1571 compatibility. Monitor with undocumented opcodes. Decimal operands. More device numbers. Backups load from any device. 256 kB Flash memory. Improved freezer circuit and kill function.