Re: W.: RE: [stella] Super Fast Scrolling

Subject: Re: W.: RE: [stella] Super Fast Scrolling
From: Glenn Saunders <cybpunks@xxxxxxxxxxxx>
Date: Wed, 11 Apr 2001 08:33:09 -0700
At 03:31 PM 4/11/2001 +0200, you wrote:
We've a horizontal resolution of 160 pixles, right? PF0-PF2 give you a PF resolution of 20 Bits.

It should be reminded that not all games use playfield for background elements.

Stargate is a good example of smooth horizontal scrolling using sprite elements for the background. This has obvious limitations, but it's doable.

Now, how do you make a 4-pixel jump if one PF bit is 8 pixels wide? Is this a special trick?

If only there were a TIA function to shift the entire playfield 1-7 bits left or right...
That would have made smooth horizontal scrolling (although still low resolution) possible.
That's something that definitely would have been possible to add way back then, as it would have meant adding delay as in the sprite positioning/sizing which they were already doing.

As soon as the hardware designers saw Surround they knew that playfield bitmaps were going to be possible, but it was probably too late to redesign the chip to anticipate scrolling games. I don't think any arcade games featured horizontal scrolling yet in early 77... Maybe Drag Race.

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