> of course I mount them in the NES machine first. What I mean is that all consoles > n64, snes, a2600, segacd,... load their software list roms fine, just the NES > complains about a wrong format.
I think you're misunderstanding how software list ROMs work. You're intended to do "mame nes smb" or whatever and MAME then knows from there how to load everything, it's just like arcades. If you want to run random ROM files then you would load them that other way.
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