Subj : Re: Summer Games
To   : Frank Linhares
From : Andreas Kohlbach
Date : Sun Jun 09 2019 05:03 pm

On Sat, 08 Jun 2019 20:32:30 +1300, Frank Linhares wrote:
>
>  TL> As long as the doves stay in the sky and the fire stays OUT of the sky
>  TL> and away from the ground, they might have used vertical interrupts to
>  TL> switch sprite sets as the electron beam hit certain parts of the screen.
>  TL> Think of it like a layer cake. Each
>  TL> layer can have up to eight sprites which are independent of the sprites
>  TL> in any other layer. On the 64, the layers can be different widths. You
>  TL> can have dozens of sprites on the screen at the same time but each group
>  TL> of eight can only stay in its own
>  TL> layer.
>
> Many of the demo scene demos from back in the day (and currently) took
> advantage of vertical interrupts to make incredible demos. I would bet that
> Epyx did the same.

Thank you and Tom. So vertical interrupts might made this
happen. Amazing, because in 1984 the Commodore 64 was only two years old.
--
Andreas

My random thoughts and comments
https://news-commentaries.blogspot.com/

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