marqs
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@Blade you save profiles individually as prof00.bin, prof01.bin etc. at the root of fat32/exfat formatted SD and then can load one via the option. You can then save the profile on an internal slot if you prefer not keeping the SD inserted. No batch import currently exists.
Hi,
C16 version of Lumacode was not finished when the OSSC decoding part was completed so there’s no a readymade preset yet. You could however edit Atari 7800 LC sampling preset and set H. samplerate to 342 as the first step. Apparently the board utilizes minimal sync and backporch so next you need to tune down those too on OSSC side, and also probably reduce Clamp position and width into half from video opt. menu. Together with the usual phase adjustment that should give stable (but incorrect) colors, so the last step is to load a proper palette. Below are links to test PAL and NTSC palettes for C16 to be used in 7800 mode.
It’d be important to know if Pro’s HDMI audio output reproduces the same issue. There are many things that can wrong in OS sound mixing but those would be then audible on the digital output too. Please also try different sampling rates & resolutions on PC side. FYI: Pre-ADC gain only applies on analog audio inputs and makes no difference on digital sources.
It’s been replaced with SD load profile
@vess: BFI operates on frames of deinterlaced 480i so the end result should have same amount of dim/flicker as with equivalent 480p source. You can control the insertion ratio with “BFI for duplicated frames” setting, but obviously going beyond 1 only works for 180Hz, 240Hz etc. output.
Unfortunately there has been no volunteers to start working on the feature over these years. This was recently also brought up elsewhere and I promised to add basic support for input selection and profile loading in near future. Somebody less overloaded can then expand support further if necessary.
Is the HDMI source outputting LPCM 2.0 48kHz? In case it’s not visible/selectable, you can try selecting EDID for Pro that indicates support for nothing else.
It’s a bit hard to follow what has been tried out, but you shouldn’t need any extra HW if you own Extra AV out card. That however assumes your HDMI consoles output LCPM 2.0ch output. In some cases it cannot be set manually but you need to select “2ch audio” EDID preset under AV4 video in opt.
There is now plan to include support for simulataneous RGBS output via VGA as apparently there is interest for such.
Does the capture card properly support 55Hz sources and is capture framerate adjusted accordingly?
You should first try adjusting Sync options -> Analog sync Vth.
The DFP presets are fully customizable incl. resolution and aspect. You just need to know exact timings for 1440×900@60 since it’s not a standard VESA mode.
When populated with optional parts, it additionally supports cvbs and s-video. VGA should not be connected simultaneously, however, to avoid double termination. PAL50, PAL60 and NTSC support has been verified with both interlace and non-interlace modes.

The product page doesn’t have much detail on how incoming sync is buffered and converted to HV (?) sync for VGA output. You can try adjusting “Sync opt -> TTL Hsync Vth” with RGBHV source, but without more details it’s hard to say what could be wrong if no sync is reported at all.
April 19, 2026 at 11:47 AM in reply to: OSSC Pro Expansion out to Hydra Scart – No stable image #69215It sounds like the switch does not like pure composite sync for whatever reason. I’m here assuming its sync input includes 75ohm termination, otherwise the signal level may be too high for the receiving logic.
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