I notice you’ve asked for “long content” with the subject line — but this phrase is quite brief and could refer to several different things.
Downloading a UniBIOS for MAME is legally grey. You typically need to own an original Neo Geo console and cartridge to dump the BIOS. However, some emulator front-ends provide open-source alternatives. uni bios23 zip
Think of UniBIOS as a master key for your Neo Geo, instantly granting features that would have required complex modifications or were simply impossible with the stock BIOS. I notice you’ve asked for “long content” with
Change the game region instantly between Japan, USA, and Europe. This unlocks uncensored graphics, original blood splatters, and localized text. and Europe. This unlocks uncensored graphics