@MasterOfTheWind

I think what you are trying to do is very complicated and you have to have quite some knowledge to get this working.
So many people can't help you with that.

Have you looked into an easier solution ?
You can use the "CVBS/Composite Video" output of the Raspberry pi if your TV supports it.
The the quality of the CVBS/Composite video signal is quite acceptable on an old TV.

Updates!

I have gotten somewhat of a picture to have display (IGNORE THE MESS 🤣)

https://i.imgur.com/uCDczXZ.jpeg

This was achieved using the following modelines in the config.txt

hdmi_ignore_edid=0xa5000080 config_hdmi_boost=4 hdmi_group=2 hdmi_mode=87 hdmi_force_mode=1 hdmi_timings=1024 0 48 104 152 768 0 3 4 23 0 0 0 60 0 88509090 1

It's still obviously very distorted but what is odd that the pixel clock I'm using, 88.5MHz was the only way to get some semblance of an image. However according to the manual for my display it should be a pixel clock of 64MHz for 1024x768 60hz (resolution I'm using rn) and a pixel clock of 108.18MHz for 1280x1024 60hz

Any reason why the pixel clock is so off? Is my code still wrong? Ultimately I think this will boil down into me opening up the CRT and messing with the sync pots but I'd like to avoid that if possible.

Any further guidance or help is greatly appreciated 😄.

@mahoneyt944 said in Retropie video output to G07 Electrohome crt:

Is there a way to set rgb manually or change palettes? G07 is considered standard res /low res monitor.

Not sure if there's such a thing as a 'palette' for an analog signal, but no, have no idea. You may want to ask in the raspberrypi.org/forum forum and provide some pictures.

@mitu Yes, it is!

So I thought I had better post to say that I solved my own problem. I had to get sync from SCART pin 19 on the Pi2SCART's female connector, not pin 20. I did not know about male SCART leads swapping pins 19 and 20. I hope this post might help somebody else out one day.

Besides the pictures and the seller's page, there's no much info about VGA666RGBs. They say it's compatible with Raspbian/RetroPie/etc., so I assume it works similarly to other GPIO analog video add-ons, using the standard vga666 'driver'.

For RGP-Pi, I remember it outputs RGB via Scart, so it might not be the first choice if your monitor has no Scart inputs. Not sure about the driver, though.

@mitu that make sense .. thanks for the help.

@DJMoss Adding active cooling eliminated the slowdowns I encountered while running some MAME or NeoGeo games.

​Solved. Bad VGA cable.

here's a couple projects I've done with an LED matrix marquee

RetroPie based ==>https://www.instructables.com/id/Vertical-Bartop-Arcade-With-Integrated-PIXEL-LED-D/

PC Based ==>https://www.instructables.com/id/Arcade-Machine-With-Changing-LED-Marquee/

Here's a guide for setting up this LED marquee and RetroPie ==>http://ledpixelart.com/files/retropie/ .

Runcommand onstart and onend is used here. When a new game is launched, a script runs which passes the rom name to the LED marquee software (http://pixelcade.org) which is then displayed on the panels. Both still image PNGs and GIF animations can be displayed by game.

This project also includes artwork that has been manually re-mastered for 128x32 for that classic 8-bit look. Disclaimer, I'm the creator for this project and sell these as kits.

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@SigmaX what OS are you running in the Pi3 ?

Adding this line to Mednafen VB.cfg:

video_refresh_rate = “50.0”

Fixes the timing issue, hope this post helps anyone with the same issue. Runs great now!

( btw, definitely lower the audio_out_rate to around 33200 or something like that, and sample fidelity to lower and add some audio time skew, no framedrops or sound skips now that I could notice even when playing in 3d )

I tested this with success. But I had to set dtoverlay=dpi24 and dpi_output_format=6 to fix some incorrect colors and use the below NTSC 320x240 timing line:

hdmi_timings=320 1 23 30 34 240 1 4 3 15 0 0 0 60 0 6400000 1

@sonpluck

Not a problem.

No one have any idea? Something to do with hdmi timings maybe? How do I solve this?

Now, finally I found another image from the retropie facebook grp... tried it and BAM, no more color problems!!! Wth?
Guess I need to compare the configs since this last one was pre-configured for crt.

Awesome! :) Who would have thought-.. Thanks all!

@nitrogen_widget yeah if you set the pi to 320x240 i believe it will display in 480i. Ugh...

Great, many thanks for the answer! :D I am going to hook up my RPi with HDMI -> VGA and VGA -> Scart so I got scared as I already ordered proper adapters and haven't even thought about it :P
I will try to give some update as soon as I got some time to test it (it would need additional RPi settings to be changed so probably it will take me some time).

@melvin-fox The diagram is on the original post but I will link it here in case you missed it:
http://www.geocities.ws/podernixie/htpc/vga2euro.gif
Anyway you just don't join the Hsync and Vsync together, you must put a 1k resistor on each line before combining them together.