feipoa wrote on 2022-05-02, 03:46:Interlaced modes of interest are: […]
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Interlaced modes of interest are:
1024x768x16-bit
1280x1024x8-bit
I think they are at 43.5 Hz.
I don't think my LCDs can go above 75 Hz at these resolutions.
Thank you for confirming the resolutions .
So 43.5 frames per seconds , 87 fields per second (2 fields for each frame) it is .
I am pretty sure that an OSSC would be able to handle to handle (input and passthrough) 1024x768p@87Hz and 1280x1024p@87Hz (progressive) as the pixel clocks of those modes are within its capabilities, but that would still require a monitor capable of accepting an 87Hz rate over DVI/HDMI . I have not tested this, however .
As for 1024x768i@87Hz and 1280x1024i@87Hz (interlaced), I have no idea how an OSSC would react to that. For the sake of argument, even if the OSSC is capable of dealing with those (or can be made to do so through a firmware update) on input, the OSSC's de-interlacing abilities may not be able to handle an 87Hz field rate (I have no idea, the OSSC can BOB deinterlace 1920x1080i@60Hz), so you might be stuck with interlaced 87Hz on DVI/HDMI output, which is much less likely to work than progressive 87Hz . Whether anything more or better is possible (and likely to be implemented) on OSSC, would best be answered by posting on the OSSC github . OSSC Pro (not yet available) maybe much more flexible in this regard .
Since your monitor tops out at 75Hz and I would guess it to be very likely that just about every LCD monitor on the market won't handle interlaced resolutions at an 87Hz field rate, I don't see many options short of finding a very old scan converter that can handle 1024x768i@87Hz and/or 1280x1024i@87Hz (interlaced) on input and both deinterlaces and converts the framerate to either 60Hz, 70Hz or 75Hz . If such a thing exists, that is .
That being said, except for early and/or low end VGA cards with RAMDAC or internal bandwidth limitations, many (most ?) better VGA cards from at least the mid 90s onward supported at least 1024x768p@60Hz in 16-bit color, AFAIK .