[Coco] Finally RGB from a coco 2

[meridian .]

Nice pictures.
Hope for my coco 2 :)
Le 2 juil. 2015 00:56, "lciotti at lrlc.us" <lciotti at lrlc.us> a écrit :

> Ed you are working very hard on these projects put me on the list to buy
> these when they are ready!
>
> Lou
>
> Sent from my iPhone
>
> > On Jul 1, 2015, at 6:53 PM, Zippster <zippster278 at gmail.com> wrote:
> >
> > Hi Darren,
> >
> > The comparators weren’t behaving as I expected on the first prototype,
> so I’m laying out a second
> > one with optional hysteresis on the LM339s to enhance stability, and
> individual voltage dividers instead
> > of the very hard to adjust networks I had on the first one.
> >
> > I may add a header for a piggyback board with a circuit using an AD725
> ic for composite and s-video
> > (artifact support) that will hopefully be the clearest composite
> possible on a CoCo2 (in addition to the VGA).
> >
> > There’s also a collaborative project I’m working on with Brendan
> Donahe.  An MC6847 VGA board using an
> > Altera Cyclone IV FPGA. I just ordered our development prototype PCBs
> last week.  This one will support
> > artifacts directly once we have it developed.
> >
> > We will definitely have some 6847 VGA options eventually.  :)
> >
> > - Ed
> >
> >
> >> On Jul 1, 2015, at 3:56 PM, Darren A <mechacoco at gmail.com> wrote:
> >>
> >> I think I would rather wait for Ed's 6847-to-VGA project. Any updates on
> >> the progress Ed?
> >>
> >> - Darren
> >>
> >>
> >>> On Wed, Jul 1, 2015 at 1:05 PM, Zippster <zippster278 at gmail.com>
> wrote:
> >>>
> >>> I don’t know.
> >>>
> >>> I asked Fred about schematics on Atari Age, he declined, saying he
> wanted
> >>> to offer kits and upgrades.
> >>>
> >>> My guess would be the transistor circuit inverts Y and level
> (amplitude)
> >>> adjusts Y, øA, and øB.
> >>> The small board probably handles component to RGB matrix conversion,
> the
> >>> the HDMI converter
> >>> box as scan-doubler to 31.4khz for the monitor.
> >>>
> >>> - Ed
> >
> >
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > https://pairlist5.pair.net/mailman/listinfo/coco
>
> --
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>