I threw together a quick updated version off the Frozen VGA cable.
The difference to the original frozen VGA cable is the Sync seperator IC. The frozen cable uses an LM1881 that outputs composit and Vertical sync.
The frozen cable used the composit sync as the Horizontial sync which works quite well but isn't 100% accurate.
My updated version uses the LMH1980 which seperates the Horizontial and Vertical sync from the Green signal line.
480P video output looks great but the 720p output has a little black bar on the right side off the screen.
I don't have enough time to test out all the different Bioses out there and having multiple testers would be great.
I got one more fully assembled external VGA mod based on the LMH1980 here that i would need a tester for.
The Adapter looks like this and only needs a VGA mod flashed to work. No internal mod is needed!


The price would be 30€.