Overseas engineers recreate Sega's unreleased hardware "Sega Neptune". In fact, the cartridges of the Genesis/Super 32X/Master system also work.

Overseas engineers recreate Sega's unreleased hardware "Sega Neptune". In fact, the cartridges of the Genesis/Super 32X/Master system also work.
 Overseas engineers recreate Sega's unreleased hardware "SegaNeptune". A video of the actual working board being created and stored in a chassis made based on the materials of the time has also been released, and it has become a hot topic. It can be said that SegaNeptune, which only exists as a prototype, will materialize in 2025....

The linked article is in Japanese.