Re: [stella] Krokodile Cart prototype review

Subject: Re: [stella] Krokodile Cart prototype review
From: "Oliver Achten" <achten@xxxxxx>
Date: Fri, 27 Feb 2004 12:45:35 +0100 (MET)
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


GMX ProMail (250 MB Mailbox, 50 FreeSMS, Virenschutz, 2,99 EUR/Monat...)
jetzt 3 Monate GRATIS + 3x DER SPIEGEL +++ +++

Archives (includes files) at
Unsub & more at

Current Thread