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Forums > C64 Coding > Sync video and sprites issue

2011-08-07 21:40

Kaizen
Account closed

Registered: May 2009
Posts: 23

Sync video and sprites issue

Hi,
during the work I'm doing the last few weeks I came across a weird problem.
I had coded with care some video effects in raster interrupts, including classic colored raster barlines.
Everything was perfectly synchronized and worked fine, but when I added one sprite on video the synchro went fucked up.
I wonder if it could be an emulator problem or if the same happens even on real hardware.
Have you ever encountered such a case?
THX. ;-)

2011-08-07 21:59

Mr. SID

Registered: Jan 2003
Posts: 421

Sprites take away CPU cycles, because the VIC needs to read the sprite data to display it. See the VIC article (http://www.zimmers.net/cbmpics/cbm/c64/vic-ii.txt) for details. Not an emulator bug.

2011-08-07 21:59

TWW

Registered: Jul 2009
Posts: 541

0/10... Poor troll..

(in the off chance you actually are serious, read up with the VIC article...)

2011-08-07 22:55

Kaizen
Account closed

Registered: May 2009
Posts: 23

Thanks! :-)

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