You wrote:
> This is interesting-- and kinda reminds me of something from working on
> Star Wars last night... My Star Wars board was hooked up to my WG and
> definately exhibited some bowing inward-- like a pincushion adjustment was
> missing. Everything else looked fine though, and when viewed on my scope
> in X-Y mode everything was nice and linear looking... So this would tend
> to suggest that the Star Wars output stages are fairly linear too?
OK, for completeness I checked the Tempest schematics (which I also have at
work ;-) Tempest has basically the same correction circuit and multipliers as
Space Duel. If I recall, Gravitar/BW are the same (it's been a while since
I've done hard core debugging of Gravitars)
Given the data we have, I think it is safe to extrapolate and say that games
designed for the WG have a correction circuit using multipliers, and games
designed for the Ampliphone (MH, Quantum, SW, ESB) do not (Star Wars
included, although I don't have those docs at work ;-)
My working assumption is that this correction circuit will be useful for the hack.
As for schematics for the adapter board, I have never seen such a beast. If
you want to borrow a Gravitar/SD -> MH converter board and trace circuits
(ick), let me know.
Ray
