[jmmliberty]

@Kekstier It’s a pretty uncommon set, and I’m a mere enthusiast, so I don’t want to “uhm, akchewally” all over the place, but this is a presentation monitor, and it absolutely operates at 37.9kHz! It up-converts 15.7 to 37.9kHz! I’ll attach a few screenshots of the service manual if you don’t believe me.

Side note – I took @marqs advice, modified the adv. timing of 1024×768 to match the basic SVGA timing, and it worked! I’m not sure why it didn’t work when I did that same thing with a custom resolution on the Retrotink 4k I borrowed, but OSSC Pro wins again!

[jmmliberty]

I have this same issue with a Zenith CRT presentation monitor – 800×600@60 only thru VGA (it also accepts 480i only thru YPbPr). I had been using an HDFury X4 to accomplish the 800×600@60 scaling, but that device stopped working. I was worried something was wrong with the TV, but I was able to use OSSC Pro to get 480i working on the YPbPr inputs. I’ve tried making custom resolutions for 800×600@60 with a borrowed Retrotink 4k, but I couldn’t get the timings right. I was using an online calculator that Retrotink suggests to come up with timing recipes. Since none of them worked, I’m not confident I understand all the active/backporch/sync/polarity numbers.

If I start by modifying the 1024×768 adv. timing by changing the active resolution to 800×600, do I need to change the synclen & backporch? I tried finding timing requirements in the Zenith manual, but it doesn’t say anything about those numbers or polarity. I just know it’s very picky about what kind of 800×600@60 it takes because everything I tried with Retrotink gave me the exact same failure message as the TV in @rpgwaiter’s post

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