Glitches in area5150 demo

[spark2k06]

The demo has several glitches, many of them in the graphics. Since the changes made to centre the screen with the border on and the removal of ghost lines in the first and last row, new glitches have appeared, especially with the border on:

849f940

Before:

After:

However, we do not currently have the source code for the demo either, which makes it very difficult to resolve various issues, which may have a lot to do with the continuous resolution changes that the demo performs.

Until then, I will prioritise the smooth running of games and software in general over this demo.

I open issue to keep an eye on it, or in the event that a developer is encouraged to investigate the problem, which in any case has to do with overscan times.

[spark2k06]

work-around for timings issues with the last changes:

bcdd8c6