| Option Category | # # CORE MISC OPTIONS # |
| Description | This option lets you load different versions of BIOS files. For example the NEO-GEO has several different versions of it's BIOS and you can select one here. You can generate a list of supported BIOSes by using the -listxml command or by using "BIOS Selection" in the MAME options menu. Each system that needs a BIOS will have a default version that it will load anyway. If you have changed this setting in the mame.ini file then you can use the -bios default value to run the driver's default BIOS. |
| Full Command | -bios <string> |
| Alt. Command | none |
| Reverse Command | none |
| Example | mame64.exe mslug -bios euro |
| mame.ini Command | bios |
| Command Default | default |
| Argument Format | <string> |