I should clarify that with respect to '2600 programming.... The '2600
author *HAS* to generate a 60Hz signal for the NTSC TV - so the basic draw
loop *is* running at 60Hz. But the actual game internals (that is, the
speed at which objects move/animate) may be running at 30Hz.... or 20Hz or
some other rate.
Cheers
A
----- Original Message -----
From: "Andrew Davie" <adavie@xxxxxxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Saturday, December 21, 2002 10:20 PM
Subject: Re: [stella] 60fps vs 30fps
> The rate at which a game performs its tasks doesn't have to have a 1:1
> correspondence to the rate of the TV frame display. The TV frame display
> always proceeds at 60Hz for NTSC (actually, 59.94 but who's counting) and
at
> 50Hz for PAL. If the game does everything it needs to in one frame, then
> it, too, is running at 60Hz (NTSC). If, however, the game does things
over
> two TV frames (that is, it takes two frames to update everything it needs
to
> for one game 'cycle') then the game is running at 30Hz. If it takes 3
> frames for your game to do everything it needs to do (drawing, etc.) then
it
> is running at 20Hz (60/3). 20Hz is about the low-limit of acceptable
> animation - below that things start to get jerky and/or flickery.
> Cheers
> A
>
> ----- Original Message -----
> From: "Aaron Bergstrom" <Aaron.Bergstrom@xxxxxxxxxxxxxx>
> To: <stella@xxxxxxxxxxx>
> Sent: Saturday, December 21, 2002 10:07 PM
> Subject: [stella] 60fps vs 30fps
>
>
> > What's the basic difference between a 60 fps game vs a 30 fps game? Is
> > it just a matter of when you turn the VBLANK on and off or is there
> > something more... or does it not have anything to do with the VBLANK at
> all?
> >
> > Aaron
> >
>
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