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 Oliver -- GMX ProMail (250 MB Mailbox, 50 FreeSMS, Virenschutz, 2,99 EUR/Monat...) jetzt 3 Monate GRATIS + 3x DER SPIEGEL +++ http://www.gmx.net/derspiegel +++ ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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