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
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