Subject: Re: [stella] does the processor stop during VSYNC? From: Eckhard Stolberg <Eckhard_Stolberg@xxxxxxxxxxxxxxxxxxxxx> Date: Mon, 06 Apr 1998 17:28:27 +0200 |
At 22:21 05.04.98 -0500, you wrote: >When you do a VSYNC, does the processor wait until it's really time for >the next frame to begin before processing resumes (like a WSYNC), or >does it just send the sync signal to the TV and keep on running >regardless of how many scan lines have passed since the last time? I'm >hoping it's the former, of course, but I'm guessing it's probably >really the latter. The emulator I'm using (Stella 0.7) seems to think >any number of scan lines in a frame is fine, but I don't know how much >faith I should put in its emulation. Unlike the Wsync register, Vsync is not a strobe register. Instead it lets you turn the vertical sync signal on and off. So what you have to do to get a stable picture is: make sure the correct number of scanlines have passed, turn on Vsync, wait for 3 scanlines via Wsync and turn off Vsync. Ciao, Eckhard Stolberg -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html Don't post pirate BINs to Stellalist. Be a programmer, not a pirate. Write the best game, win framed autographs of famous Atari alumni!!
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