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FPGA GF1 Neptune: a Sega Neptune resurrected as an FPGA, made in Brazil
Hardware Retro

FPGA GF1 Neptune: a Sega Neptune resurrected as an FPGA, made in Brazil

RetroVault Team 14 May 2026 71 views 0 comments
The Sega Neptune was a never-released console that was intended to combine Mega Drive and 32X in a single box. A group of Brazilian developers have just shown their working GF1 Neptune FPGA with the 32X core active.

The Sega Neptune is one of the most mythical consoles in Sega's history - not because it made its mark, but because it never existed in the hands of players. This 1994 prototype was to integrate a Mega Drive and a 32X module into a single compact case. Sega canceled it before it was released. A group of Brazilian developers just changed the game.

The GF1 Neptune FPGA Project

The team behind the GF1 Neptune showcased its working FPGA console, showing the 32X core in action on real hardware. The project is entirely community-based, developed in Brazil, and aims to faithfully reproduce Sega Neptune hardware via an FPGA implementation. The demo video shows games running in real-world conditions, with the two Sega systems working together as intended in 1994.

Why it’s remarkable

Reproducing the Neptune FPGA is doubly complex: you need to implement the hardware of the Mega Drive and that of the 32X, two separate systems with their own processors, video chips and communications buses. The core 32X already functional represents the largest of the work accomplished. The team thanks “many important people in the community” for their technical help.

The project is not yet available for sale. To be continued on the MiSTer FPGA forums and the Brazilian team’s social media.

Source: Time Extension

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