Summary: The FujiNet team's work to bring modern networking features to the original Nintendo Entertainment System has reached an important design stage. Its Rev0 cartridge schematics and PCB layout are complete, while software is already working in emulation. Crucially, the project has not yet been demonstrated on a physical NES.
Networking meets Nintendo's 8-bit console
FujiNet began as an open-source networking and peripheral project for classic computers and has since expanded to other retro platforms. Its NES adaptation is particularly ambitious: rather than simply adding a modern flash cartridge, it aims to make network-hosted files and FujiNet-aware software accessible through a cartridge designed for Nintendo's original hardware.
The project's official status page describes a 72-pin Rev0 cartridge using an RP2354B microcontroller, an ESP32-S3, two 512K SRAM chips, USB-C and microSD. Its design includes support for a range of NES memory-mapper configurations.
What already works?
In FujiNet's desktop emulation environment, the configuration software can browse network-hosted TNFS files and SD storage, then load NES game images. The project also lists ports of familiar card and board games and network-enabled utilities. Developers have worked on adaptations of Double Dribble and Tecmo Bowl for two-player network play, alongside an Excitebike track-sharing feature.
That is a meaningful software milestone, but it must not be mistaken for a finished accessory. FujiNet says the Rev0 cartridge has not yet been built or tested on a real NES. The team is looking for contributors who can review the design, manufacture test boards and help validate the hardware. There is no consumer-ready NES FujiNet cartridge to order today.
Why open hardware matters
Public firmware, board files and documentation make it possible for hobbyists to inspect the design, reproduce experiments and improve it over time. For an ageing console ecosystem, that openness can be as valuable as the finished gadget: the knowledge remains available even if a particular manufacturer stops making hardware.
Console Revive take
The NES is still inspiring inventive hardware decades after its launch. FujiNet is worth following because it explores new capabilities for original consoles rather than replacing them. We are particularly interested in the point at which the first real cartridge is tested; until then, the desktop emulator is the practical way to explore the project.