@Mocce1972 What did you mean? - RbPi4 is out rate?

Correction: 240p ou 480i et non pas 320p

Finally, I modified the recalboxrgbdual.ko driver by forcing 50 Hz. Since I have a Pi2Scart which, unlike the RGB Dual, doesn’t have a 50Hz/60Hz switch, I altered the C source code so that it always runs at 50 Hz, as if I had an RGB Dual set to 50 Hz, then I recompiled it for the version I'm using (Recalbox 9.2.2-pulsar).

It works! Of course, I have to use only PAL ROMs; otherwise, Recalbox will (rightly) switch to 60 Hz mode.

@FMU2638 said in Recalbox rgb jamma sur crt vga:

Bonjour,.j'ai remplacé la platine de ma jeutel par un vieux crt lg de 21 pouces (moniteur pc).
Que me conseillerez vous pour brancher un rgb jamma ? Un adaptateur HDMI to VGA branché le raspberry ? Ou un adaptateur jamma vers VGA ? Si vs recommandez cette dernière quelle matériel recommanderiez vous pour une qualité optimale ?
Sinon faut il attendre un rgb dual v2 permettant cette config?
Merci pour votre aide!
Fabien

PS le raspberry est un pi 5

@madbrain

Hi there, I had the same problem as you. I couldn't get the Pi3 composite output working with overscan for Recalbox. I've spent quite a while figuring this out on my Pi3 but I think I've got it.

It may be contradictory in some places, but please set your config.txt in the following way, making sure that each line is in this exact order:

[pi3] # Raise the first security limit up to 70 instead of 60 for pi3 temp_soft_limit=70 enable_tvout=1 #NTSC-480i sdtv_mode=0 #NTSC-240p #sdtv_mode=16 #PAL-576i #sdtv_mode=2 #PAL-256p #sdtv_mode=18 #4:3 sdtv_aspect=1 #16:9 #sdtv_aspect=3 disable_overscan=1 #this is on purpose hdmi_force_hotplug=0 hdmi_ignore_hotplug=1 dtoverlay=vc4-fkms-v3d #fkms not kms overscan_top=32 overscan_bottom=32 overscan_left=32 overscan_right=32 include crt/recalbox-crt-config.txt

Uncomment (delete #) from the start of the line for the resolution and mode you need. It is also important that you have 'fkms' instead of 'kms'. You will likely need to adjust the overscan values to the desired amounts after testing a few times. For me (Sony Trinitron) I used -14, -5, 13, 25 respectively. You can also use overscan_scale=0 instead of the four individual values and see if that's better for you.

Additionally, you have to edit the file cmdline.txt. The entry is a single line and must stay that way. At the end of the existing text, add:

video=Composite-1:720x480@60ie

for NTSC-480i.

For NTSC-240p you will need to keep 720x480 but the end should say @60e (no i means no interlacing). Setting 720x240p here will cause the image to only appear across the upper half of the screen.

Likewise, for PAL-576i, it's 720x576@50ie. For PAL-256p it's 720x576@50e.

I hope this helps you and anyone else with this issue.
P.S. I think updating Recalbox will reset all this. Might be better to put it into recalbox-crt-config.txt but I'll cross that bridge when I get to it.