Hi Thomas!
> Not that urgent. I notice them only when I set my TV very bright.
Nevertheless a mistake which HAS to be fixed! ;-)
> > Btw, those distortions are caused by the composite sync line of the TIA.
>
> I don't think so. The Star Fire logo is drawn in two steps.
>
> First "Star" is drawn and the part of "Fire" is skipped (different code).
> Then
> there are only distortions on the "Star" lines (which don't change at
> all!).
>
> When the game starts with drawing "Fire" the distortions on that block of
> rows are immediately there, even if only the first pixel of "F" is
> displayed.
>
> So, IMO it can not depend on any display signal, it must be the code.
The composite sync line does just what you describe here: if the voltage
level is too high, it mixes signals from the CPU into the video picture. If you
add a resistor (470k-1k), those distortions magically disappear. Better would
be buffering the sync signal through an addtional gate/latch, something
which i should have done to your mod... :-(
#Have a nice day
Oliver
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