Downscaling: Problems connecting the OSSC Pro to my CRT TV via Scart

[Retrogeezer]

Hey and hello, I hope you guys can help me with trouble shooting because I‘m at a loss at what else to do. It‘s my first foray into the world of scalers.

I bought the OSSC Pro and extra AV out extension to downscale from my pc to my Bang & Olufsen Beovision 1. Not sure if the type of CRT is important here, but the more information the merrier, I guess.

I also bought this VGA to Scart converter cable (with the light gun module):

https://ultimatemister.com/product/rgb-scart-cable/

It came with this note...

„MISTer.ini config:
forced_scandobler=0
vga_mode=rgb
composite_sync=1
vga_scaler=0
direct_video=0*
*this option must be =1 if you use HDMI to VGA DAC“

...but I figured that‘s what the extra av out extension does automatically?

Without connecting the OSSC Pro to my PC, I turned it on with the remote and set it to 480i and pushed the scaler button. When I push the scaler button, nothing on the LED screen changes to signify a mode switch. And then when the TV turns on, the picture is rolling. I recorded a video of it:

https://youtube.com/shorts/8Z9mIrogOk8? ... 8WIpme5Hhp

(It took me a bit to fumbling with the remote to select the correct input while filming at the same time, so please be patient)

I tried to press some random buttons on the remote because I couldn‘t find enough infos on how to continue in such a case. I mean, using the OSD is impossible with the picture moving this fast.

I read, that in some setups a sync combiner is required but I thought that‘s what extra av out extension would provide?

Is it the cable, wrong settings, missing hardware?

[Josh128]

What resolution are you outputting from your PC? The cable itself will not scale it, and the OSSC Pro may not take certain resolutions via SCART. You should probably have posted this in the OSSC Pro thread. Also, the cable is pinned for RGBS coming from a Mister, you need to make sure the VGA coming from your PC is set to composite sync and that the pinout is the same from the PC RGBS as the Mister.

[it290]

Why not just use a VGA cable? This seems needlessly complex.

[BuckoA51]

You can't connect a VGA cable to a 15khz TV.

I suspect you didn't set the OSSC Pro itself to composite sync output. Menu->Expansion opt.->Extra AV out mode.. then use left and right to select "RGBCS/RGBS".