exactly. Using BIOS files from a newer MAME set (like 0.139 or 0.250) often causes "Required Files Missing" errors in mame2003. Filename Sensitivity : Files must be lowercase (e.g., neogeo.zip NEOGEO.ZIP
Popular budget retro handhelds (Anbernic, Miyoo, Powkiddy) heavily utilize MAME 0.78 for smooth arcade performance. Inside the MAME 0.78 BIOS Pack: Key System Files mame 078 bios pack new
What (e.g., Raspberry Pi/RetroPie, PC/RetroArch, Anbernic handheld) are you using? exactly
