[Coco] No pixel wasted

[S Klammer]

An admirable target for certain, and I hope to add one to my CC3.  I
understand the composite variety involved, if not the hsrdware required, it
would be nice if there was enough commonality for an adjustable core based
upon incoming signal.  If the 6847 component itself is generic enough, that
may be enough.

The VGA output is useful... thoughts on a possible HDMI output?

sk
On Sep 18, 2014 12:36 PM, "Luis Antoniosi (CoCoDemus)" <
retrocanada76 at gmail.com> wrote:

> each computer has a different video output. CSync, Negative HS/VS, Positive
> HS/VS, 1.2-2.0V RGB at 60Hz, 0.8-1.6V PAL at 50Hz  etc.
>
> Make them all to work in FPGA would be impossible or utterly complex that
> would not fit. Voltage wise is impossible. I would need specialized ADCs
> etc.
>
> I am not even sure if I can use a MUX to switch between NTSC and PAL PLLs.
>
> My target is make a Coco3 pristine output.
>
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> Luis Felipe Antoniosi
>
>
>
> On Thu, Sep 18, 2014 at 12:22 PM, S Klammer <sklammer at gmail.com> wrote:
>
> > Yet, based on his "fantastic" progress, having it provide the same
> > stability for the other modes in the same hardware is definitely
> > beneficial.
> >
> > I presume this utilizes the CC3 RGB port... could this design (or a minor
> > addition) also support composite video?
> >
> > sk
> > On Sep 18, 2014 12:13 PM, "Steven Hirsch" <snhirsch at gmail.com> wrote:
> >
> > > On Wed, 17 Sep 2014, Luis Antoniosi (CoCoDemus) wrote:
> > >
> > >  I reduced the speed from 229Mhz to 114Mhz, the SDRAM works better now:
> > >>
> > >> http://imgur.com/MY0ExuW
> > >>
> > >> It also fixed the artifact in coco1/2 graphics screen.
> > >>
> > >> But for coco3 games like roboco, thexder I still get some minor
> > flickering
> > >> in some areas. Like it generates those video modes with a slightly
> > >> different pixel clock ? I have a 1986 GIME only.
> > >>
> > >> All the other resolutions are pixel perfect: 32, 40, 80 columns, pmode
> > 1,
> > >> 2, 3 and 4.
> > >>
> > >
> > > I am utterly disinterested in gaming, but would really like a stable
> > > 80-col solution.  Let us know when the design is finalized?
> > >
> > > Steve
> > >
> > >
> > > --
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> > >
> >
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