: BIOS files must remain zipped . MAME reads them directly from the archive; do not decompress them into individual files.
Leo tried to close the emulator. The window didn’t close. Instead, a new list populated the left pane. It was a directory of every arcade game ever made—and thousands that weren't. He saw his own childhood memories listed as .rom files. all mame bios
If a game won't boot:
MAME (Multiple Arcade Machine Emulator) requires BIOS files to act as the "operating system" for specific arcade hardware platforms : BIOS files must remain zipped