It is based on Robin Edwards Unocart-2600 (https://github.com/robinhedwards/UnoCart-2600) and the extensions of Christian Speckner's (DirtyHairy) fork (https://github.com/DirtyHairy/UnoCart-2600). The PlusCart has no SD-Card, but an ESP8266 to connect to a local WiFi Network and the Internet. The PlusCart downloads the ROM-files from an Server in the Internet called the "PlusStore". The way this is done is similar to the way the Unocart-2600 loads ROMs from the FAT filesystem on the SD-card, while the VCS is performing a waitroutine in his RAM. Additionally the PlusCart has one more interesting feature. It offers internet access to the ROM Developers, these functions are called "PlusROM".