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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

Jetpac on ZX Spectrum

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zxspectrumjetpac
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  • Y
    Yorick
    last edited by 22 Nov 2016, 10:16

    Has anyone got Jetpac to work? I cant get it to go past the boot screen where it says Jetpac is loading.

    D 1 Reply Last reply 22 Nov 2016, 10:39 Reply Quote 0
    • D
      dudleydes @Yorick
      last edited by dudleydes 22 Nov 2016, 10:39

      @Yorick According to World of Spectrum, Jetpac runs on a 16k machine. By default, lr-fuse, which I assume is you are using, runs the the 128k machine - you will see the line fuse_machine = "Spectrum 128K" in the file /opt/retropie/configs/all/retroarch-core-options.cfg.

      If you change to 48k machine type in the RGUI, then Jetpac will run. Now this will be a pain to change between 48k and 128k machine for newer games that require the extra memory.

      This is my solution. It may be not be optimum but it works.

      In the folder /opt/retropie/configs/all/, create a text file called retroarch-core-options-fuse48k.cfg and add the following line:

       fuse_machine = "Spectrum 48K"
      

      Now we need to make sure Jetpac uses the 48k machine so in the ZX Spectrum roms folder, create a text file called Jetpac.tzx.cfg. The file name must match the tape so you may have to amend. In this file, add the following line:

      core_options_path = /opt/retropie/configs/all/retroarch-core-options-fuse48K.cfg
      

      Save and Jetpac should now run. If you take a look at retroarch-core-options-fuse48k.cfg after launching Jetpac, you'll notice RetroArch will have added extra lines. It's best to leave these.

      For any other games that run a 16k machine such as Deathchase, all you need to do is copy the cfg file and rename it so that it matches the tape.

      G W S 3 Replies Last reply 22 Nov 2016, 11:10 Reply Quote 2
      • G
        GtBFilms @dudleydes
        last edited by 22 Nov 2016, 11:10

        @dudleydes Awesome, I was wondering about this as well. I'm not at my cabinet just now but I'm hoping I can specify the control mapping in that cfg file too - the problem I have with Jetpac is that it uses fixed keys, or Kempston stick, but other spectrum games allow redefined keys (e.g. Chuckie Egg) I wanted to keep the option to redefine the keys to my joystick for some games, but have the joystick behave like a Kempston for others.

        1 Reply Last reply Reply Quote 0
        • W
          windale @dudleydes
          last edited by windale 22 Nov 2016, 14:03

          @dudleydes @GtBFilms Or it can be done the easy way. Set the default emulator as fuse-128k and then when loading Jetpac press a key to open the runcommand menu and choose option 2 and set to run this rom with fuse-48k.

          1 Reply Last reply Reply Quote 0
          • D
            dudleydes
            last edited by 22 Nov 2016, 15:43

            @windale I believe those options are available if you are using standalone version of fuse, not the libretro core.

            @GtBFilms The way I have my Speccy games setup is that, to make Kempston the default joystick in lr-fuse, I have added the following line to /opt/tetropie/configs/all/zxspectrum/retroarch.cfg:

            input_libretro_device_p1 = "513"
            

            I've not been able to get my PS3 controller working in Chuckie Egg using lr-fuse so I use ZEsarUX instead. It lets me use config files to map the keyboard to a gamepad which I don't believe is possible in lr-fuse.

            Incidentally, I have found this issue to be relevant to all games from Ultimate Play the Game, such as Atic Atac and The Great Escape, even if they can run on a 48k machine.

            W 1 Reply Last reply 22 Nov 2016, 16:27 Reply Quote 0
            • W
              windale @dudleydes
              last edited by 22 Nov 2016, 16:27

              @dudleydes Yeah, I don't use lr-fuse because it's horribly outdated. It's still based on Fuse 1.1 and the porter said he's not bothered about updating it till 2017 at the earliest. Standard Fuse is v1.3, has better compatibility, autoboots TRDOS disks and supports the Recreated ZX Spectrum Keyboard.

              1 Reply Last reply Reply Quote 0
              • Y
                Yorick
                last edited by 22 Nov 2016, 22:07

                Thanks for the replies! I have got Jetpac running now, however my controller doesn't work in it. I am using XBOX 360 wireless controller and I set it up as Kempston joystick which works fine in other games such as Manic Miner. I can get to an options screen by pressing the B button which has an option for selecting Joysticks which I set to Kempston but it didn't help.

                D 1 Reply Last reply 22 Nov 2016, 22:29 Reply Quote 0
                • D
                  dudleydes @Yorick
                  last edited by 22 Nov 2016, 22:29

                  @Yorick How did you set up your controller as Kempston?

                  The default joystick emulated in lr-fuse is Cursor. You can play Manic Miner with the arrow keys which explains why your controller works here.

                  To change the default to Kempston, you can either change the joystick emulated in RGUI or, for a permanent solution, you can edit /opt/tetropie/configs/all/zxspectrum/retroarch.cfg as described in my previous post.

                  1 Reply Last reply Reply Quote 0
                  • Y
                    Yorick
                    last edited by 23 Nov 2016, 12:21

                    @dudleydes I changed the line in /opt/retropie/configs/all/zxspectrum/retroarch.cfg to input_libretro_device_p1 = "513" like you suggested.

                    Then in the Jetpac game there is an option menu called peripherals with an option to select Kempston where you have to press space bar to select it and then enter to save settings.

                    D 1 Reply Last reply 23 Nov 2016, 12:41 Reply Quote 0
                    • D
                      dudleydes @Yorick
                      last edited by 23 Nov 2016, 12:41

                      @Yorick I'm not sure about the peripherals menu you are speaking about.

                      This is the menu I see
                      https://www.mobygames.com/game/zx-spectrum/jetpac/screenshots/gameShotId,87771/

                      If I press SELECT on my controller, then a keyboard overlay appears. I can then use my controller to "press" 4 to select Kempston and 5 to start a game.

                      1 Reply Last reply Reply Quote 0
                      • Y
                        Yorick
                        last edited by 23 Nov 2016, 13:44

                        My Xbox controller doesn't work at that screen so I press 4 on my Keyboard to select Kempston and then 5 to start game. Then the game runs but my controller still doesn't work except for the B button which opens a menu where you can select option-peripherals and activate Kempston by pressing space and enter.

                        D 1 Reply Last reply 23 Nov 2016, 14:12 Reply Quote 0
                        • D
                          dudleydes @Yorick
                          last edited by 23 Nov 2016, 14:12

                          @Yorick I cannot see the "option-peripherals" - can you confirm which emulator you are using?

                          1 Reply Last reply Reply Quote 0
                          • Y
                            Yorick
                            last edited by 23 Nov 2016, 14:15

                            lr-fuse and run Rom as 48k

                            D 1 Reply Last reply 24 Nov 2016, 10:10 Reply Quote 0
                            • D
                              dudleydes @Yorick
                              last edited by 24 Nov 2016, 10:10

                              @Yorick I'm stumped! All I can suggest is to test with other games.

                              1 Reply Last reply Reply Quote 0
                              • G
                                GtBFilms
                                last edited by 15 Nov 2017, 01:14

                                Sorry to dredge up an old topic, but hopefully this is a quick fix.

                                I've updated my /opt/retropie/configs/zxspectrum/retroarch.cfg to add

                                input_libretro_device_p1 = "513"

                                And JETPAC now works fine with Kempston joystick. BUT my other favourite game is Chuckie Egg, which doesn't support Kempston.

                                So for that game I need to switch the mapping to Kempston off, and go back to the default cursor joystick (which works fine).

                                On the runcommand window there is an option to 'edit custom Retroarch.cfg config for this RoM' but when I type the original contents of retroarch.cfg in there, the joystick still appears to be mapped as a Kempston.

                                Is there another code I need to explicitly set to revert back to a cursor joystick just for this one particular game?

                                Thanks

                                pjftP 1 Reply Last reply 15 Nov 2017, 07:40 Reply Quote 0
                                • pjftP
                                  pjft @GtBFilms
                                  last edited by 15 Nov 2017, 07:40

                                  @gtbfilms I'm pretty sure that in the RGUI you can just save a game specific configuration file that'll do the trick. I think that's how I have mine set up.

                                  1 Reply Last reply Reply Quote 1
                                  • S
                                    ShinraPie @dudleydes
                                    last edited by 15 Jun 2020, 17:55

                                    @dudleydes said in Jetpac on ZX Spectrum:

                                    @Yorick According to World of Spectrum, Jetpac runs on a 16k machine. By default, lr-fuse, which I assume is you are using, runs the the 128k machine - you will see the line fuse_machine = "Spectrum 128K" in the file /opt/retropie/configs/all/retroarch-core-options.cfg.

                                    If you change to 48k machine type in the RGUI, then Jetpac will run. Now this will be a pain to change between 48k and 128k machine for newer games that require the extra memory.

                                    This is my solution. It may be not be optimum but it works.

                                    In the folder /opt/retropie/configs/all/, create a text file called retroarch-core-options-fuse48k.cfg and add the following line:

                                     fuse_machine = "Spectrum 48K"
                                    

                                    Now we need to make sure Jetpac uses the 48k machine so in the ZX Spectrum roms folder, create a text file called Jetpac.tzx.cfg. The file name must match the tape so you may have to amend. In this file, add the following line:

                                    core_options_path = /opt/retropie/configs/all/retroarch-core-options-fuse48K.cfg
                                    

                                    Save and Jetpac should now run. If you take a look at retroarch-core-options-fuse48k.cfg after launching Jetpac, you'll notice RetroArch will have added extra lines. It's best to leave these.

                                    For any other games that run a 16k machine such as Deathchase, all you need to do is copy the cfg file and rename it so that it matches the tape.

                                    Hello Dudleydes,

                                    Apologies for digging this post from it's grave, but I'm struggling trying to get your fix to work for loading 48K Roms in LR-Fuse? Is there any chance you could give me some guidance?

                                    1 Reply Last reply Reply Quote 0
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