Hello to both of you,
Many thanks for your follow up and insights !
I use a LG 24MK400H-B PC monitor (FullHD 1080) and have the latest update installed on my OSSC. I tried to force the image to a 4:3 ratio using the settings as found on the forum. It doesn’t seem to change the distortion of some lines and even seem to be incompatible with some resolutions (314p works fine for example but I have a black screen with 625i resolutions / the original PlayStation keeps changing resolutions).
The idea would be to force the output to 4:3 no matter the resolution: any suggestions ?