Unibios 4.0 Chip SNK Neo Geo Multifunction BIOS MVS / AES (Patch MV1B / MV1C)

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 the cheat menu, advanced diagnostics, and switching between arcade and console modes. It also unlocks hidden features like blood censorship and offers a clear, customizable interface.

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

WARNING: The original BIOS must be disabled and two wires soldered, so installation requires soldering experience. We are not responsible for any hardware damage. Proper documentation is strongly recommended before proceeding.

Features

• Quick switch between MVS (arcade) and AES (console) modes
• Region selector: USA, Japan, Europe (removes blood censorship)
• Access to DEBUG DIP Switch and DEVELOPER mode
• Built-in cheat engine with over 1570 cheats
• Score saving support in AES (requires memory card)
• PICKnMIX support (requires 161-in-1 cartridge)
• Custom cheat support by editing memory
• Jukebox player for music without game effects
• CRC32 checker to verify ROM integrity
• True USA region support (coin display in bottom corners)
• Activatable VS arcade mode (like JAP BIOS version 6)
• PC-2-NEO: send and receive data via cable from PC