[Coco] Zaxxon - CoCo3 w/RGB

[John B]

Thanks guys.  That makes sense.  Hopefully I can get a hold of Z-89 (Zaxxon
Clone) which was made for the CoCo3.

On Sat, Jul 11, 2015 at 6:58 PM, L. Curtis Boyle <curtisboyle at sasktel.net>
wrote:

> Agree completely. Some games (on a Coco 3) can be patched, if they used
> PMODE 4 in a PMODE 3 style (basically treating it as a 128x192x4 color
> screen), by changing the mode stored at $FF22 to PMODE 3, and then changing
> the 4 palettes (in some cases, you can actually make the games look better
> than they originally looked, even on NTSC). Others used it as a PMODE 4
> (256x192x2) but used odd/even pixels for color in parts, but these will
> show with odd artifacts around the edges of shapes designed for the 256
> horizontal resolution (Donkey King, and some hi-res adventure games that
> drew text as if it were a 256 resolution screen are two examples).
> So, you can patch some things to look just as good as NTSC (if they did a
> “pure” 128x192 4 color, just using the artifacting NTSC PMODE 4 color set),
> and others will partly work, but in some spots look worse.
>
> L. Curtis Boyle
> curtisboyle at sasktel.net
>
>
>
> > On Jul 11, 2015, at 4:49 PM, Nick Marentes <nickma at optusnet.com.au>
> wrote:
> >
> > On 12/07/2015 2:01 AM, John B wrote:
> > > When I load Zaxxon with my CoCo3 using RGB it looks horrible. The
> colors> are way off. Is there a toggle or patch for the game to enable RGB?>
> >
> > Colors way off on RGB?
> >
> > Zaxxon doesn't have color. It uses Black and White PMODE4.
> >
> > The only reason you are meant to see reds and blues is because of the
> false colors that come from NTSC composite/RF video.
> >
> > On RGB where the colors are true, black and white is all you'll see.
> >
> > I think you have a patched version of Zaxxon with forces PMODE3. It this
> case, yes, the colors will be off and this is normal when the original game
> is patched to use a mode it wasn't meant for. The 4 colors of PMODE3 can be
> redefined on a CoCo3. Unfortunately, you are stuck with odd colors of a
> CoCo1/2.
> >
> > Nick
> >
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> >
>
>
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