Just picked up one of these headsets for $20, B&H photo has them refurb for that right now. Have had my eyes on these to try and hack and mod a bit.
But reading over the info, it's gonna be a tough one, maybe not really worth it.
The Vagle VRD-1000 is pretty interesting, this PDF has some interesting details about what it does internally:
Interesting parts: I see HDMI to Display Port and DDC. DDC appears to be "Display Data Channel" which is an i2c protocol. See here for some info on that and how that fits in to USB - C https://www.mouser.com/applications/...e-c-adds-hdmi/
Perhaps DDC is used to instruct the goggles how to display - for instance it's been mentioned of people getting images, but 90 degrees rotation? Perhaps DDC is used to instruct the goggle how to orient the image, etc.
Then also I see mentioned "Coordination info" this is probably motion tracking info I'm guessing. Personally I'm not as interested in this aspect, I'm more interested in just being able to control the displays, maybe get general HDMI input working.
Here is an interesting github project that appears to be using or attempting to use the VRD-1000 along with this headset https://github.com/TrueOpenVR