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    Recalbox sur TV CRT en RGB

    Recalbox Général
    recalbox crt rgb
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    • dcervi
      dcervi last edited by

      Some Spanish fellows are working on a direct GPIO to SCART cable with audio. You can see the thread here: http://www.elotrolado.net/hilo_proyecto-rgb-pi-15khz-100-pixelperfect-scart-rgb-audio_2198660

      0_1478860808288_Mlsp4eR.jpg

      0_1478860835082_S2PqZHm.jpg

      0_1478860950012_Junf9mk.jpg

      0_1478860969997_Ow1bqWW.jpg

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      • Scandy
        Scandy @dcervi last edited by

        @dcervi said in Recalbox sur TV CRT en RGB:

        http://www.elotrolado.net/hilo_proyecto-rgb-pi-15khz-100-pixelperfect-scart-rgb-audio_2198660

        COOL!!!

        Any information about price / release date yet?

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        • Substring
          Substring last edited by

          I'm surprised that they get audio with the very few GPIOs left.

          @ian57 can PWM be used on Pi3 ? would it be worth if we want a single GPIO2SCART cable ?

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          • Substring
            Substring @dcervi last edited by

            @dcervi but he is not giving away the schematics 😕

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            • dcervi
              dcervi @Substring last edited by

              @subs Nope. I think his intention is selling it. He already ordered some PCBs with smd components. He is working on a script to make RetroPie change resolutions on the fly.

              It seems the perfect solution. We will see how it all works when(if) it gets released...

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              • Substring
                Substring @dcervi last edited by

                @dcervi anything that is software we can handle at least as good as retropie. Too bad for his cable, i'm sure we can go through without it

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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

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                        • 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

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                            • 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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