Terra Onion MegaSD

[kdubmods]

From their landing page...

https://terraonion.com/en/producto/megasd/

Complete FPGA recreation of the entire Mega-CD / Sega CD hardware into a plug and play Cartridge

World’s First Mega-CD / Sega CD FPGA Optical Disc Emulator 

• Plays both ISOS (bin+cue) and ROMS.

 • RAM based cartridge for instant boot.

• Compatible with all original and region free patched Mega-CD / Sega CD bios.

• Supports Megadrive / Genesis, Sega CD / Mega-CD, Master System and 32X games (requires 32X add-on).

Fully Supports original Megadrive and Genesis hardware (Nomad included but requires simple mod to get audio cd on sega cd games) 

• Fully compatible with Analogue Mega Sg!

• Easy to use interface for navigating your collection with screenshots, genre, year and description.

• Save State support for Megadrive and Genesis Cartridge games (8 slots).

• Built in cheat engine for Megadrive and Genesis cartridge games.

• Emulates all different Genesis / Mega Drive / Master System / 32x cartridge mappers.

• Stores all different Genesis / Mega Drive / Master System / 32x cartridge saves into microsd card.

• Per game Mega-CD / Sega CD Backup RAM and Cartridge RAM stored into microsd card.

• Master System FM Core.

• In-Game menu for fast reboot and swapping games (Genesis / Megadrive and Mega-CD / Sega CD).