[Coco] Dragon32 with factory Daughterboard SAM chip

[Ken H.]

Photos and schematics of this board are posted here:
http://archive.worldofdragon.org/phpBB3/viewtopic.php?f=5&t=151

On Thursday, October 31, 2013, Luis Antoniosi (CoCoDemus) wrote:

> this is for the PAL timings right ?
>
> since there is no PAL 6847 the extra lines are added by a secondary chip.
>
>
>
> On Thu, Oct 31, 2013 at 5:02 PM, Tormod Volden <lists.tormod at gmail.com<javascript:;>
> >wrote:
>
> > On Thu, Oct 31, 2013 at 4:50 PM, Phill Harvey-Smith wrote:
> > > Yep I have a Dragon 32 like it. The daughter board is Dragon Data
> > PN48200,
> > > the extra circuit is a 74LS74 and a 74LS32. It appears to ensure that
> the
> > > changes to /HS and DA0 happen at co incident with the E clock (E is fed
> > to
> > > the CLK pin of both flipflops).
> > >
> > > I have traced the schematic in Eagle and can post if anyone wants it.
> >
> > Er, what do you think? :)
> >
> > Would this reduce interference or instabilities of the image?
> >
> > Cheers,
> > Tormod
> >
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> >
>
>
>
> --
> Long live the CoCo
>
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