[Coco] hardware scrolling

[Luis Antoniosi (CoCoDemus)]

And looks awful on LCD screens.


On Mon, Oct 28, 2013 at 9:45 AM, Simon Jonassen <simon at roust-it.dk> wrote:

> Luis....
>
> It doesn't have to be cpu intensive.....
>
> If you just flip 2 pages with different colours and different offsets via a
> vertical sync then there is hardly any overhead involved.....
>
> But the flicker is a pig !
>
> /Simon :-)
>
>
> -----Oprindelig meddelelse-----
> Fra: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] På
> vegne af Luis Antoniosi (CoCoDemus)
> Sendt: 28. oktober 2013 14:42
> Til: CoCoList for Color Computer Enthusiasts
> Emne: Re: [Coco] hardware scrolling
>
> But this is too cpu intensive too and a nightmare to render sprites over
> it.
>
> I think DragonFire is a masterpiece on that subject right ?
>
>
> On Mon, Oct 28, 2013 at 6:16 AM, Simon Jonassen <simon at roust-it.dk> wrote:
>
> > Nick...
> >
> > I have been trying to combine colours by page flipping aswell, but the
> > results are less than impressive....
> >
> > Quite alot of inherent flicker going on.....
> >
> > I'm trying to "re enable" the semigraphics feature that should have
> > been possible if they wired the vdg another way....
> >
> > The said feature is 2 different colours in 1 cell as it stands you can
> > have
> > say: (yellow/black or Black/yellow or black/black Yellow/yellow) -
> > what would have been nice was the ability to have say yellow/green
> etc......
> >
> > You can "simulate" this effect to a degree by chosing adjacent cells
> > in 2 locations but it's uses are limited...
> >
> > /Simon :-)
> >
> >
> > -----Oprindelig meddelelse-----
> > Fra: coco-bounces at maltedmedia.com
> > [mailto:coco-bounces at maltedmedia.com] På vegne af Nick Marentes
> > Sendt: 28. oktober 2013 10:52
> > Til: CoCoList
> > Emne: [Coco] hardware scrolling
> >
> >
> >  > Yes i have dabbled a little... You can scroll the screen in the
> "broken"
> > semi graphics mode.... The one where you can mix hires (only 7 bits)
> > and text/SG blocks !!
> >
> > Now that would be interesting to see! I wonder if a semigraphics
> > scroll is smooth enough?
> >
> > An 8 color mode with a black border. Semigraphics gives a completely
> > new look to the old green/buff screen modes of the VDG.
> >
> > 8 colors flickered between 2 pages to mix the colors gives a
> > theoretical
> > 64 colors (theoretical).
> >
> > The first 64 color hardware scrolling tech demo for the CoCo 1/2.
> >
> > That'll have me changing my pants!   :)
> >
> > Nick
> >
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>
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