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    Recalbox sur TV CRT en RGB

    Recalbox Général
    recalbox crt rgb
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    • dcervi
      dcervi @Substring last edited by

      @subs Yes, I'm sure. But I'm curious to see how his solution works. Anyway, it shouldn't be too hard to deduce the schematics when it is released, as it should be using only resistors as the GPIO to SCART depicted on this forum.

      He says he had to recompile some Raspberry Pi driver (¿overlay?), because the original VGA666 overlay interfered with analog audio on the Pi.

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      • Scandy
        Scandy last edited by

        @dcervi @subs I really don't get why an hardware device (this GPIO > SCART or PI2JAMMA) should be exclusively "linked" to Retropie or other distro. 😕

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        • Substring
          Substring @Scandy last edited by

          @Scandy can you explain further your mind ? What is GPIO-dependant is linked to a Pi. And I intend to beat retropie on that CRT subject 😉

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          • aTg
            aTg last edited by aTg

            Hello, I come to this forum because in other sites I have had many critics saying that I have not discovered anything new or that it was better to use an HDMI > VGA converter.

            The first thank you for the interest and the valuation on your part, I have seen that all the questions you have are really interesting and I will try to answer them, sorry for the English I am using translator.

            I am using RetroPie only for development since Recalbox is a buildroot and and it's harder to do tests but the idea once finished is to launch a patch or if the developers collaborate a specific version of Recalbox.

            The first photo of the prototype is not the complete circuit. I have done this so that it would not be so simple to clone.

            If I am thinking of selling it but for those who like to solder I thought of selling only the PCB so that each one builds his own cable at a much lower price and easier to do the circuit from scratch.(If you are patients in a little more than a week I will have the first PCBs)

            The idea is that this is mounted inside the SCART housing
            alt text

            I also have the change of resolution for each emulator, there is the section of mame that needs another more complex system but that we can develop it with time, to see if the developers of recalbox help a little, they will get a cable so that it Try them out.

            https://www.youtube.com/watch?v=KIVKS6rr4LQ

            ian57 1 Reply Last reply Reply Quote 1
            • ian57
              ian57 Staff @Substring last edited by ian57

              @subs Yep as the Pi zero, I think you can redirect the pwn on gpio... need to verify that from http://elinux.org/RPi_BCM2835_GPIOs. It is possible from 12/13 or 18/19 (http://raspberrypi.stackexchange.com/questions/49600/how-to-output-audio-signals-through-gpio), but these GPIO need to be free from the VGA666 used pins. To do that he has to use the mode 6 of the 666 (https://github.com/fenlogic/vga666/blob/master/documents/vga_manual.pdf) dpi_output_format=6 which leaves free the GPIO 18/19. He has to use dtoverlay=pwm-2chan,pin=18,func=5,pin2=19,func2=5 to redirect the audio signal to the pwm gpios.

              Afert that a simple lowpass filter on these outputs as in the case of the pi zero https://github.com/recalbox/recalbox-os/wiki/Analog-Audio-Pi-Zero-(EN) and that's all 🙂

              "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

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              • ian57
                ian57 Staff @aTg last edited by ian57

                @aTg It is a VGA66 adapter + a simple PWM lowpass filter on GPIO 12/13 for the sound integrated on a scart board, isn't it ? Simple 😄

                The idea to make it as small as possible to be included in the Scart plug is good and elegant. But with the use of gpio, you need use USB pads or usb arcade encoder. The HDMI-VGA solution allows to use the GPIO for control panel.

                Each solution has advantages and drawbacks.

                "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

                aTg 1 Reply Last reply Reply Quote 0
                • Scandy
                  Scandy @Substring last edited by Scandy

                  @subs I mean that when I'll buy the Pi2JAMMA and/or RGB-PI I really hope to not be limited to a single distro (e.g. RGB-PI working only on Retropie) but I really hope that it will be (software-side) "platform-independent". 😉

                  @aTg your project is great, I really hope it will be also affordable for people who cannot solder like me. At the moment do you have a single resolution for emulator or different resolutions for each game? Thanks! 😉

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                  • Substring
                    Substring @Scandy last edited by

                    @Scandy some parts are OS-dependant, we can't avoid that ... Despite have the same goal, retropie and recalbox do it in different ways ... The hardware part can be done rather easily (buildroot is not such a freaky beast), but supporting this hardware to its full potential can be os-linked. Up to the developpers to make the best of it, limit wbat depends on the OS as much as possible

                    @aTg i'll answer you once i check a few things 🙂

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                    • aTg
                      aTg @ian57 last edited by aTg

                      @ian57 Very easy but no one had done it, besides it is necessary to compile an overlay specifically for it.

                      I am working on another version for jamma where you will also have a port expander with 32 inputs and power for the RPI included by the gpio. Of course also with sound and RGB.
                      This version is designed for crt televisions, not for arcade cabinets.

                      The one who wants to use this in an arcade jamma cab wait to jamma-pi

                      Each emulator (console) already has its own original resolution except mame.

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                      • Substring
                        Substring @aTg last edited by

                        @aTg each crt console has several resolutions depending on the games ...

                        For arcade, i have an idea for standard horizontal games, not yet for vertical ones ... But anything that tweaks hdmi timings is os-dependant unless you write a wrapper for retroarch + some "database"

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                        • aTg
                          aTg last edited by

                          https://www.youtube.com/watch?v=g7tBX-DgD_g

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                          • Substring
                            Substring last edited by

                            Hey guyz,

                            I've been working really hard for 2 days for a Mame Resolution "DB", heree's an excerpt :

                            8080bw_drivers.c  einnings  0         m4            (8080bw)       ROT0         256x224
                            8080bw_drivers.c  shuffle   0         shuffle       (8080bw)       ROT90        256x224
                            8080bw_drivers.c  dogpatch  0         clowns        (8080bw)       ROT0         256x224
                            8080bw_drivers.c  spcenctr  0         spcenctr      (8080bw)       ROT0         256x224
                            8080bw_drivers.c  phantom2  0         phantom2      (8080bw)       ROT0         240x224
                            8080bw_drivers.c  bowler    0         bowler        (8080bw)       ROT90        280x224
                            8080bw_drivers.c  invaders  0         invaders      (8080bw)       ROT270       240x224
                            8080bw_drivers.c  blueshrk  0         blueshrk      (8080bw)       ROT0         256x224
                            8080bw_drivers.c  invad2ct  0         invad2ct      (8080bw)       ROT90        256x224
                            8080bw_drivers.c  invaddlx  invadpt2  invaders      (8080bw)       ROT270       240x224
                            8080bw_drivers.c  sitv      invaders  invaders      (8080bw)       ROT270       240x224
                            

                            I could get 100% of Mame 0.78 resolutions by combining different sources. From that, we can do anything 🙂

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                            • aTg
                              aTg last edited by aTg

                              It seems that we have been working on the same lately, I already have a prototype for arcade machines working, the look will be this one.

                              alt text

                              Characteristics:
                              Jamma connector
                              RPi power from the jamma connector
                              Over voltage protection and over current fuse
                              RGB 15kHz
                              A single filtered sound channel
                              Port Expander with extra button inputs
                              All in one pcb without any cable

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                              • ajefr
                                ajefr last edited by ajefr

                                Already working 😉
                                http://www.neo-arcadia.com/forum/viewtopic.php?f=14&t=54733

                                https://www.youtube.com/watch?v=v4pR3LKDCPw

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                                • Substring
                                  Substring @ajefr last edited by

                                  @ajefr This is not exactly the same :

                                  • RPI2JAMMA doesn't handle the sound out from GPIO, but from the jack output
                                  • RPI2JAMMA is mostly for JAMMA, where as we are, for now, more looking into a SCART system
                                  • I didn't get how you handle inputs

                                  Do you have a documentation on how to plug everything ?

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                                  • aTg
                                    aTg last edited by aTg

                                    If my version incorporates the sound by the GPIO and is much smaller, I hope the opinion of the community if you think it interesting to continue with the development of jamma-pi or you think that with rpi2jamma is enough.

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                                    • ian57
                                      ian57 Staff last edited by

                                      @ajefr @aTg I think that the thing that will make the difference is the software support 😉

                                      "UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity." Dennis Ritchie

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                                      • Substring
                                        Substring last edited by

                                        Both are great. Rpi2jamma is great for jamma-wired cabs, aTg's device is for crt only, like back in the old days 🙂

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                                        aTg 1 Reply Last reply Reply Quote 0
                                        • aTg
                                          aTg @Substring last edited by aTg

                                          @Substring I am thinking in launch a version for jamma but im not sure.

                                          I see that rpi2jamma is very expensive, could drastically reduce its cost, size and number of components.

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                                          • Akik
                                            Akik last edited by

                                            J'ai enfin mis la main sur une petite Trinitron de 36cm, je vais pouvoir me lancer dans le CRT en RGB grâce à ce post. Merci ! C'est une Sony KV-14LM1B.

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