Unibios 4.0 Chip SNK Neo Geo Multifunction BIOS MVS / AES

The Unibios 4.0 is a multifunction BIOS developed by Razoola for Neo Geo AES and MVS systems. This chip enables multiple region modes (JAP, USA, EUR), access to cheat menus, advanced diagnostics, and switching between arcade and console modes. It also unlocks hidden features such as blood censorship removal and offers a clear, configurable interface.

Compatible with most Neo Geo MVS boards and AES consoles, installation requires basic soldering skills or use of a socket. This version 4.0 is the latest, most stable, and complete officially released by the author.

WARNING: The original BIOS must be disabled and two wires soldered, so installation requires soldering skills. We are not responsible for any hardware damage. Please inform yourself properly before proceeding.

Features

• Quick switch between MVS (arcade) and AES (console) modes
• Region selector: USA, Japan, Europe (disables blood censorship)
• Access to DEBUG DIP Switches and DEVELOPER mode
• Built-in cheat engine with over 1570 cheats
• High score save support on AES (memory card required)
• PICKnMIX support (requires 161in1 cartridge)
• Custom cheats by directly editing memory
• Jukebox player to listen to game music without SFX
• CRC32 ROM checker to verify program integrity
• True USA region support (coin display on lower corners)
• Arcade VS mode switch (as in JAP BIOS version 6)
• PC-2-NEO: data transfer to/from PC via cable