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Re:Medusa is a device that allows connecting of old computer... by LargoLasskhyfv on Monday April 11, 2022 @11:33PM (#30998286)
Seems you have separate RGBHV on the monitor side. See

[·] https://en.wikipedia.org/wiki/Component_video

To get that from your PI's HDMI you'd need something like

[·] https://www.amazon.com/Portta-3-5mm-Audio-Converter-support/...

and then something like this

[·] https://www.monoprice.com/product?p_id=562

Then you'd construct a custom Modeline like described in

[·] http://howto-pages.org/ModeLines/ &

[·] https://tldp.org/HOWTO/Framebuffer-HOWTO/

for I guess 1280x1024@60Hz? Maybe you don't even need to, because that is a common VESA resolution(SXGA) which should be provided anyways? So by setting this as fixed resolution by whichever means at startup, it could work. Maybe there are a even a few different ones to choose from, with slightly different timings, polarities. Or you could change that at the monitor itself. The second pdf from your link suggests that. I mean if the picture is rolling slowly up or down, or something like that.

I don't use PIs, so I don't know how the firmware works, which modes it supports, and how this all interacts with that videocore-thing, nowadays.

But that you'd need the converter gadgets and cable from there is obvious.

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