Wrong vs. Right:

• Dreamcast CDI/GDI files: These are for console emulators (Redream, Flycast). They will not work in standard MAME.
• "Merged" ROMs: Some sites sell "MvC2 MAME ROM" as a 600MB zip. This is usually a repackaged CHD inside a zip. MAME will refuse to read this. Keep the CHD separate.

• Active Copyright: Capcom still owns and enforces the copyright for Marvel vs. Capcom 2. While delisted from digital stores in 2013, the IP is commercially dormant but legally active.
• No “Abandonware” Exemption: “Abandonware” has no legal standing. Even though you cannot buy MvC2 new on a GD-ROM, Capcom or Disney (owner of Marvel characters) retains exclusive distribution rights.
• The BIOS Problem: The NAOMI BIOS file required to run the game is also copyrighted by Sega. Distributing it is equally illegal.

, which includes an arcade-perfect port of MvC2 with modern features like rollback netplay Dreamcast Emulation: Marvel Vs Capcom 2 Chd Download Mame