Re: [stella] 60fps vs 30fps

[Aaron Bergstrom <Aaron.Bergstrom@xxxxxxxxxxxxxx>]

Oops, sorry... force of habit...  Ok... I think I get it now. So what 
bizarre thing would happen then if I ran through my vsync, my vblank, my 
192 scanlines, my overscan.... and then wasted a whole frame's worth of 
machine cycles before going back to the vsync at the top of my draw routine?

Andrew Davie wrote:

> > Hmm... so if I were to create a 30mhz game I would simply not return to
> > the beginning of the draw loop at the end of the overscan, but instead
> > use an entire frame's worth of machine cylces performing game
> > calculations before I return to the beginning of the draw loop?
> >    
>
>
> No.  Please see my earlier follow-up post.
>
> The Atari 2600 requires you to generate appropriate data for a TV frame,
> which basically consists of 262 lines at 60Hz (frames/second).  You can't
> get away from this.  If your game is to run at 30Hz, then you do the game
> LOGIC (as opposed to the TV frame generation) once every two TV frames.  But
> you still need to generate the actual frame data at 60Hz for the TV.
>
> So your draw loop must keep running at 60mph.  Let's keep the abbreviations
> correct, it's the only way we can avoid misunderstandings :)
>
> Cheers
> A
>  


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