The RAD Expansion Unit is a cartridge for the C64/C128 with a Raspberry Pi. The RAD can emulate a RAM Expansion Units such as the CBM 1700/1750/1764, CLD Super 1750 Clone, CMD 1750/1750XL and GeoRAM/NeoRAM. There is also a menu for REU-images, GeoRAM-images, NUVIE's and PRG's.