Anyone got specs? The text says it is a free standard, I'd like to build something on these specs

Well, is there nobody around, who can tell us more about "Goblin/Twin VDP" .
I'm pretty sure that somewhere on this earth, the scheme's and/or hardware are laying around.

Adriano Cunha had already made "Dual Head" using an external V9938 chip (80 columns card) and the internal V9958 on his computer... using UZIX.
Some days ago I bought a 80 columns cartridge to use in my MSX2+ computer, so I can output debug information easily when testing software in graphical mode on real MSX. It will be some kind of Dual Head too.
Besides that, I know Ademir Carchano told once he had made it (two and three VDPs in cascade, using their super imposing capabilities), but not on a comercial product.
Anyway, even GFX9000 could be super imposed with V9958, which would be nicer than separate outputs.

hemm what about 2 gfx9k chips?