[Coco] Stable colours

[Luis Antoniosi (CoCoDemus)]

Maybe.

FPGA is odd. Certain things don't work as expected from a programmers mind.

Luis Felipe Antoniosi



On Tue, Sep 30, 2014 at 1:52 PM, S Klammer <sklammer at gmail.com> wrote:

> With regards to SG6, the Coco3 will actually allow holding either F1 or F2
> to select red/orange or blue shift...
>
> Although different pixel patterns can elicit different shades, it is
> whether the pixel is odd or even numbered that determines the red/orange or
> blue... so 01 is red, 10 is blue whereas 11 would be white.  Would that be
> workable with just the one variable for the previous pixel?
>
> Shain
> On Sep 30, 2014 1:19 PM, "Luis Antoniosi (CoCoDemus)" <
> retrocanada76 at gmail.com> wrote:
>
> > well I'm using the 2-port RAM which is one read and one write. I guess
> > there is one with both. But it would add more and more wires, more and
> more
> > LE's for a crappy result.
> >
> >
> > Luis Felipe Antoniosi
> >
> >
> >
> > On Tue, Sep 30, 2014 at 1:15 PM, Luis Antoniosi (CoCoDemus) <
> > retrocanada76 at gmail.com> wrote:
> >
> > >
> > > On Tue, Sep 30, 2014 at 12:48 PM, Frank Swygert <farna at amc-mag.com>
> > wrote:
> > >
> > >> artificial artifacts
> > >
> > >
> > > You are talking about the coco1 SG6, the infamous red that is in fact
> > > orange but if you are luck you get it blue...
> > >
> > > VCC emlator does a crap job emulating them. I prefer the MESS which is
> > > close to the NTSC but the mess is much more complex.
> > >
> > > Also, I use internal RAM for 2 lines only. I have one incoming line
> (from
> > > genlock) and one outgoing line (vga output). Those lines are
> stored/load
> > > from/into the main SDRAM (which is slow and must be loaded/stored in
> > burst
> > > mode).
> > >
> > > In one clock cycle I can only have one pixel. I cannot get the next.
> The
> > > maximum I can keep the previous pixel in a variable. So at best case it
> > > would look like VCC, shifted because the first pixel wont the
> artifacted,
> > > suppose:
> > >
> > > 00 10 10 10 00 00
> > >
> > >
> > > The first 1 would remain black as the 0 would be blue, or red, or
> > > orange...what would create hard edges.. :P
> > >
> > >
> > >
> > >
> > >
> > >
> > > Luis Felipe Antoniosi
> > >
> > >
> > >
> >
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> >
>
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