Pi on Rgb scart CRT tv. B&O MX 7000

shazza6887

Hi All,

I have not messed with my Pi 1 for a very long time however i just picked up a awesome mx7000 crt over the weekend. Since there is so much info online that is a little confusing i was wondering on thought's on the best way to get a rgb signal from the pi to the scart input on the tv for both video and audio? I want to have it output true 240p so i get the nice scanlines. I am planning on picking up a pi3 to do this on.

I have thought about using a cable with the 4 points from the pi to a scart/rca adapter but im unsure if this is the best way to do it.

Any help/advice appreciated.

simonster

Hi @shazza6887

Just be aware, the 4 pole connector on the Pi only carries left/right audio and composite video (not RGB). This will work on scart, but will not give as good an output as a scart rgb signal. In fact, I'm not really sure how you would go about getting a 576i RGB signal. Maybe someone can confirm if you can do this over HDMI and convert it to RGB scart, I've seen products that claim to do this, but they all appear to have composite outputs when checked.

Si

lobi

If you want a real RGB output at 15khz at 240p (the real or near resolution the arcade and 16 bits systems), you will need extra hardware and make changes on config.txt, its easy and the quality of the image are the best that you can get in a CRT monitor (better than in a flat HDMI tv).

You could try to use an hdmi to vga conversor and then and vga to Scart conector, you would need to change the config.txt file, adding this lines for a 768x240p mode.

*hdmi_ignore_edid=0xa5000080
hdmi_pixel_encoding=2
config_hdmi_boost=4
dtparam=audio=on

hdmi_cvt=768 240 60 1 0 0 0
hdmi_group=2
hdmi_mode=87*

And removing the old video-output mode.

shazza6887

@lobi

I have been looking around at other posts etc that never ended up being confirmed, seems like an option would be to use gerts vga shield, or use a simple hdmi to vha converter (i actually have one anyways) then i was thinking i would run a vga cable and audio cable from the 3.5 socket into one of those adapters from arcadeforge although they are a little pricey at 30 euros and finishing it off with a scart cable from the adapter. Will gerts vga shield and a convertor work the same way?

shazza6887

@lobi
https://scontent-arn2-1.xx.fbcdn.net/hphotos-xtf1/t31.0-8/12998424_10153996776786291_8149403479274195519_o.jpg

lobi

Yes @shazza6887, this is the way, but you do not need to use VGA to Rsinc adapter, you can use a vga 2 rgb cable (like this https://www.amazon.com/VGA-RGB-Cable-Male-1-8m/dp/B0096TTOHG) or and VGA to Scart (in this web explain how to make the cable http://www.idiots.org.uk/vga_rgb_scart/)
And force the pi to output at 15khz (https://github.com/raspberrypi/firmware/issues/637 this way have some problems only if you want to use multiple resolutions).