Subject: Re: [stella] interlace From: Chris Wilkson <ecwilkso@xxxxxxx> Date: Sun, 25 Jun 2000 03:01:19 -0400 (EDT) |
On Sat, 24 Jun 2000, Eckhard Stolberg wrote: > At 17:59 23.06.2000 -0400, you wrote: > > >Anyone remember why can't you do calculations during VSYNC? I remember the > >discussion (a couple years back), but I don't remember the details. > > It was probably me, who did most of that discussion. ;-) I noticed that > some 60Hz NTSC games would roll on my PAL VCS/TV while most others worked > fine. The games that rolled the screen all did something during the three > lines of VSYNC. Sometimes it was only so simple things as setting up the > timer for the VBLANK period between the second and third WSYNC. Hmmm. Weird. So I was looking at some video on the scope tonight, (exciting Saturday night, huh?) and it turns out the 3 lines of VSYNC is enough. But the VCS doesn't do the serration properly. In my memory, it was 6 lines of sync, but it's actually 3 lines, with an extra pulse in the center of the line. Hmm. Waveforms, etc. will be forthcoming... I need to find a scanner first. BTW, are there any common games that roll? I'd like to see what's different about the video during VBLANK. -Chris -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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