Hdmi to vga 240p

[notthesame]

Hey everyone,
I'm running on raspberry pi4 4gb
With offical retropie, my monitor I'm using is a 2005 flat panel vga screen with only vga connection, I had to buy a vga adaptor from Walmart.
The adaptor works fine, but I was wondering if it's possible to do 240p, I did alot of testing so far and configured my config.txt

My first time using I needed to config.txt, I didn't get going until I used
hdmi_mode=1
hdmi_group=1

I'm hoping maybe someone has a basic hack for this.
I have a time limit for now cos If I can't get before Saturday, I'm gonna return this adaptor and get a crt tv or other solution, I want to be sure if I can or can't do this, so I'm asking for help at best places I can ask.

Thanks and hope I gave enough info to help me crack this case.

[mitu]

@notthesame said in Hdmi to vga 240p:

I'm hoping maybe someone has a basic hack for this.

If your monitor supports the video mode, you'll just need to add the appropriate resolution configuration into config.txt - see https://www.raspberrypi.org/documentation/configuration/config-txt/video.md. You can check after that with tvservice -s what is your current video mode.

If you're hoping to get scanlines, that won't work with a flat panel.

[notthesame]

@mitu I'm getting dvi custom rgb full 4:3 1024x768 @ 60 progressive
I was hoping for scanlines, I guess I'll just go with
a crt tv if I find one or shader scanlines, mine look awfully.
Can you help me on this one.

I did try this integer scale on or full but I'm getting thick black scanlines then light areas but scanlines look gone, I was told to fix this is to turn on or off integer?

[mitu]

If you want to run in a '240p' resolution, then choose the appropriate video mode in config.txt. This will not add a scanline effect to your video, since you're not using a CRT.
If you want a scanline effect, then use a shader.

Integer scale is just for configuring how to scale the video image, but doesn't have a direct relation to 'scanlines'. When toggling it on, the video image might have black bars, since the core provided resolution might not fit exactly, with an integer scale factor, to your display's resolution. For instance, if the core provided height is 240px, then this will not fit, with an integer scale factor, to your display's 768px since 2 x 240 = 480, 3 x 240 = 720, 4 x 240 = 960, etc.

[ReadyPlayaWon]

@notthesame said in Hdmi to vga 240p:

I did try this integer scale on or full but I'm getting thick black scanlines then light areas but scanlines look gone

There are a lot of parameters you can adjust to get them looking to your liking.

I'm running a lcd 1280x1024 and i prefer my scanlines to be subtle ie. not noticeable from a distance, but noticeable when close to my monitor.

example of my scanlines (zfast_crt_standard) setting for Galaga ...

[notthesame]

@mitu

i tired to ajust but idk which is the best scanline shader, all seem to give this effect

[notthesame]

@ReadyPlayaWon cool i need to try that