The Cassiopei is a versatile device. It can load .TAP files, .PRG files but it can also load .PRG files directly from your PC's hard disk. And 50 times faster then normal. So now you can cross-develop CBM software. Program on a PC and test it on the real hardware. In the video about the Cassiopei you can see a demonstration of developing a PET/CBM program on the PC with CBM prg Studio and then transfer it to real hardware.