I think I mentioned the #Chyron Lantern64 card I bought... Well this is it working! At the moment it's set to Free Run, I need to provide a video source to try out the overlay features.
Best part is, the host PC doesn't have to do anything. It's controlled with text commands. All these graphics are running completely in the background.
I just noticed something about the Chyron card. There's a power/reset LED on the back of the PCB. That's a bit weird (in the sense you can't see it) ... except you can. The LED shines through the middle of the lantern, masked by the solder mask. Someone put some real effort into that.
@foone better way to do what? the character overlays, or document it? it took a hell of a lot of archive.org digging (and mirroring Chyron's FTP locally) just to get enough to make it work!