C64C used as a floppy disk drive for Plus/4. Using 1541 Ultimate-II on C64C to mount floppy disk images stored on the SD card. Serial IEC cable is connected between 1541 Ultimate-II and Plus/4.
Everything is nearly the same as in the C16 and C64C cooperation video. However, this time the disk flip is being tested.
Showing Rocket Science by Bauknecht & The Electronic Knights, which uses two sides of a floppy disk.