Look for the FDS BIOS in the "bios" folder first

[anewuser]

Currently, if you specify the FDS BIOS location, it saves the absolute path of the file, and there's no way to modify it to a relative path with the GUI. What about these ideas to make the emulator truly portable?

• If you haven't manually specified a location for the FDS BIOS file, puNES could first automatically look for the BIOS in its own bios folder before giving an error
• If you manually set a location inside the puNES folder, it could save it as a relative path

The same could be done for the Game Genie ROM.

[punesemu]

This can also be done.

[punesemu]

So, I'll explain how the search for both bios works (already now): If you have not entered any file in the "Settings->General", puNES looks for the bios in the "[puNES home]/bios" directory ("disksys.rom" for the FDS and "gamegenie.rom" for the GG) and if he doesn't find it he reports an error. If you have entered the file in the "Settings->General" he will try to load that first and if not find will look for the bios in the directory '[puNES home]/bios', if it's not found here it reports an error.

[anewuser]

It'd be safer to check the file hash, since No-Intro uses a different name and extension for the same file: [BIOS] Family Computer Disk System (Japan) (Rev 1).bin, and it can also be found with other names online.

An easier solution is to just mention the file name you expect and leave it up for the user to rename it: FDS Bios file (disksys.rom).

[anewuser]

@punesemu Since these files can also be found online with other names and extensions, what about just adding parentheses to these strings with the expected filenames?

You could also prompt for it the first time the user tries to load a Disk System image, like Nestopia UE does:

puNES could also show an "Incompatible BIOS detected" message when disksys.rom doesn't match any of the supported files.