Re: [stella] to overscan or not to overscan?

Subject: Re: [stella] to overscan or not to overscan?
From: Greg Troutman <mor@xxxxxxx>
Date: Mon, 02 Dec 1996 12:35:15 -0800
Piero Cavina wrote:
> According to the Stella programmer's guide, a NTSC TV frame generated by
> the 2600 consists of 3 VSYNC lines, 37 VBLANK lines, 192 TV picture lines
> and 30 "overscan" lines.
> The question is: do we really need to do the "overscan" lines?
> I'm writing my first game for the 2600 and I didn't care about overscan (I
> just draw more empty TV picture lines). After a lot of try-and-miss I could
> get a steady picture, so I don't think it's really needed. What do you
> think?

I think if your game displays steadily, then you must be right.  I'm not
even sure what overscan really means.  I just draw 192 lines in my game
then WSYNC 30 times before looping to VSYNC and it looks fine.

Thank you for your support,


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