prtscn Posted April 2, 2020 Report Share Posted April 2, 2020 Access to RGB and HV signals on the motherboard - YES. Output voltage correction/boost - Can be made. Bios - what bios to use? Since all custom bios are fake VGA mode. Talking about REAL VGA, bypassing encoding chip and directly tapping into nvidia chip. Quote Link to comment Share on other sites More sharing options...
eeksdee Posted April 2, 2020 Report Share Posted April 2, 2020 Bypassing the encoder you wouldn't get VGA, you'd get the digital signals from the GPU. Quote Link to comment Share on other sites More sharing options...
prtscn Posted April 3, 2020 Author Report Share Posted April 3, 2020 3 hours ago, eeksdee said: Bypassing the encoder you wouldn't get VGA, you'd get the digital signals from the GPU. You bloody damn right, but we can extract HV sync. So we can use existing RGB rails from the encoder? I have tried to research datasheets from conexant chip, i does talk about switches - mode select. Question is, do stock xbox bios work with vga mode "jumped". Quote Link to comment Share on other sites More sharing options...
SS_Dave Posted April 3, 2020 Report Share Posted April 3, 2020 There is a forum member Ryzee119 working on this. https://www.retrorgb.com/true-xbox-hdmi-mod-announced.html Cheers SS Dave Soft modding is like masturbating, It get's the job done but it's nothing like the real thing. Quote Link to comment Share on other sites More sharing options...
prtscn Posted April 3, 2020 Author Report Share Posted April 3, 2020 7 hours ago, SS_Dave said: There is a forum member Ryzee119 working on this. https://www.retrorgb.com/true-xbox-hdmi-mod-announced.html Cheers SS Dave Soft modding is like masturbating, It get's the job done but it's nothing like the real thing. crt monitor no hdmi :(. crt - no scaling, no problems. Quote Link to comment Share on other sites More sharing options...
prtscn Posted April 4, 2020 Author Report Share Posted April 4, 2020 My guess is that sega chihiro system have all the answers for the true VGA mod. Just dump chichiro bios and patch VGA parts to Xbox bios, 1+3 mode (VGA). Quote Link to comment Share on other sites More sharing options...
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