刚搞定9寸彩监，xp64位，发现不能dx11，4870，又去淘5870去了。

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You must specify .toc or .cue (with .bin or .img) file, if you use .bin directly, it will recognize how genesis/megadrive rom.

For the bios you must put it in ./mednafen/firmware (default path) or you must specify the exact path where you placed the bios.






This is the typical error that occurs when you try to load the .bin file instead of .cue file.