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Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

RetroPie runs different game than on pc?

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nes romsnes emulatorretropie 3
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  • R
    RetroNewbie 0
    last edited by 18 Dec 2021, 18:28

    I am having trouble with this weird issue, does anyone else have the same and were you able to solve it?

    So I have RaspberryPi 3 and to it i have installed Retropie 2/3 and installed it according to the instructions of this website.

    Most of the games I have added work, however I am having trouble with one Nes game. Game starts but it plays some weird hack of the game. (Playable but not what is normally in the game.) Normally I would now just think that there is problem with the rom-file, but once I try to play the same rom-file on my pc there isn't this issue and the game is as it should be.

    My Retropie has automatically installed these emulators: lr-fbneo-nes, lr-fceumm, lr-nestopia and lr-quicknes. I try to switch between those emulators and all give the same result of wrong game. Is there some other nes emulator i should be using?

    S 1 Reply Last reply 18 Dec 2021, 18:53 Reply Quote 0
    • M
      mitu Global Moderator
      last edited by 18 Dec 2021, 18:48

      Can you be more precise - what game has this behavior ? What's the ROM file name/checksum ? Are you using the same emulators on your PC also and get different results ?

      1 Reply Last reply Reply Quote 0
      • S
        sleve_mcdichael @RetroNewbie 0
        last edited by 18 Dec 2021, 18:53

        @retronewbie-0 said

        (Playable but not what is normally in the game.)

        Like, glitchy backgrounds and stuff? I've had a couple NES titles from my "main" source that do that; they play alright but like, I can't see the floor so it's hard to know what to do. I'm not sure on how the technical aspect of it works, but I think it has something to do with a "mapper" that's used in the different games (not like an in-game map, but rather how the data is arranged on the cartridge or something like that.) Tried a deferent source, got a different version of the ROM, and all is well. So far it's happened on Mighty Bomb Jack (NES) and Super Turrican (also NES).

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        • R
          RetroNewbie 0
          last edited by 18 Dec 2021, 19:04

          @mitu @sleve_mcdichael

          The game I am having the problem with is Super Mario Bros. It is apparently some loading glitch so that it loads up the game from World 0 or Minus World which ever is the proper name.
          It runs only the first level and then ends.

          And thanks Mitu, I actually had on my pc different emulator and now once I downloaded and tried the rom on one that Retropie uses, the same glitch happens.
          So I guess the solution is that I must install to RetroPie a new nes emulator, since the 4 I had ended with the earlier results.

          M 1 Reply Last reply 18 Dec 2021, 19:05 Reply Quote 0
          • M
            mitu Global Moderator @RetroNewbie 0
            last edited by 18 Dec 2021, 19:05

            @retronewbie-0 said in RetroPie runs different game than on pc?:

            So I guess the solution is that I must install to RetroPie a new nes emulator

            More likely you have a bad/hacked ROM. What's the filename/checksum of the ROM ?

            R 1 Reply Last reply 18 Dec 2021, 19:15 Reply Quote 0
            • R
              RetroNewbie 0 @mitu
              last edited by 18 Dec 2021, 19:15

              @mitu The filename is Smb.nes
              Unfortunately I don't know what is checksum so I don't know how to check it?

              The file has passed on with me from decades ago and I know that I have once played it through. So the game itself should be fine, unless the file has somehow corrupted from moving from a harddrive to harddrive.

              M 1 Reply Last reply 18 Dec 2021, 19:35 Reply Quote 0
              • M
                mitu Global Moderator @RetroNewbie 0
                last edited by 18 Dec 2021, 19:35

                @retronewbie-0 said in RetroPie runs different game than on pc?:

                Unfortunately I don't know what is checksum so I don't know how to check it?

                A checksum is unique number/string for a file that's calculated based on the file's contents. This is a method to ensure you have the a correct file, regardless of filename.

                Use 7zip to get a CRC/SHA checksum of the file - https://www.blogsolute.com/7-less-known-features-of-7zip/26665/. Compare it to the official SMB ROM checksum from Tosec/No-Intro - if it's not a match, you have a hacked/modified ROM file and that's the reason the emulators behave differently.

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