I have Direct Video working with the UGREEN adapter already, but I was still getting quite a bit of audio buzzing (at normal volumes) with my TV, so I picked up a Tripp-Lite P131-06N adapter cheaply since someone earlier in the thread mentioned it having less audio noise than even the UGREEN one. When I first tried it I just got a jagged, rolling pattern on my TV, so after a bit of fruitless MiSTer.ini tinkering I just assumed that my adapter had a different, incompatible chipset or that using RGB SCART instead of a BNC cable like the other user had was making the difference.
I went back to using the UGREEN adapter, but last night I tried blindly loading a core with the Tripp-Lite one out of curiosity, and it displayed perfectly! I didn't test every core, but at least NES, SNES, GBA, SMS, Mega Drive, PC Engine, Neo Geo and Commodore 64 (switching between NTSC and PAL) were working fine. I notice that another user earlier in the thread had a similar issue with the Menu core giving a rolling picture while other cores were displaying correctly, but I'm using a consumer TV from the mid-80s rather than a broadcast monitor as they were.
After that try these to see if anything changes:
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Following the advice they received, this morning I've been trying out different video_mode lines for the menu with the scaler enabled adapting the above example, but I'll presumably need something different for a consumer TV. I've tried various "240p" video_mode lines I've found in different threads without too much luck. The closest so far was this, which seems stable horizontally but rolls vertically, and also seems a bit squished (due to the pixel clock?):
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Any guidance would be appreciated!