Made a cartridge for the #FujiNet #PicoROM prototype. All data is transferred over the bus, it doesn't plug into the serial port in the back of the CoCo. As a prototype it's still missing things and has to be plugged into a computer which is what the USB-C connector is sticking out of the top. #RaspberryPiPico #RetroComputing #VintageComputing #TRS80CoCo