On 1 February 2012 20:42, Simon Owen <[email protected]> wrote: > On 01/02/2012 20:07, Thomas Harte wrote: >> I notice that whatever effect it thinks it is relying on doesn't work >> in Sim Coupe. > > It's certainly nothing that's implemented at the moment, but if it's > shown to be a real effect (like border pixels), it should go in. Though > it does feel like it could be specific to CRTs, and more likely those > that suffer from distortion due to intensity differences?
I know the TV I first used would exhibit something similar. I wouldn't have thought you could ever rely on it though. Certainly the 8833 I ended up with wouldn't do it. > I remember there being some sample interlaced SAM pictures, which may > have relied on the effect to give the necessary vertical shift to help > with colour blending. I thought that was just about the fact that the TV would display alternate lines each 50Hz - so you could switch screens between two and effectively double your Y resolution, the problem being that you could never tell which would be the "top" and which would be the "bottom". If you're thinking of playing with stuff like that in SimCoupé, how about adding in a screen start address OUT mod? I'd love to see what could have been done with just a small change to the ASIC design :) Geoff
