This is a fun hobbyist cartridge that operates primarily as a REU up to 16MB and an instant-loader for PRG programs. It also plays NUVI movie files loaded into the emulated REU, and can be used as an emulated GeoRAM cartridge.Additionally, it runs Doom on the Pi using the Commodore for the keyboard and video (yes, this is kind of pointless but also fun to do).Someone recently started a SuperCPU emulation project that also runs on it, though this is not quite working yet (don't buy it for this feature, unless you want to follow along with the development).You can search the web for the relevant documentation and projects around it.Included in this listing:1 RAD Expansion Unit cartridge
1 Raspberry Pi 3 Model B
1 64GB PNY MicroSD card, loaded with the required software
1 MicroUSB power supply to power the Pi externallyBe aware that the Doom project runs on PAL machines only, which is what I used for this listing.The cartridge will come configured to run as a RAD Expansion Unit and with the jumper set to be powered directly by the cartridge port in the Commodore. I do recommend removing the jumper and powering it externally with the provided power supply, because it's more reliable and gives you more control over the cartridge booting.The photos are for reference only; you'll receive a recently built and tested cartridge with the identical specifications.