[Coco] Dragon32 with factory Daughterboard SAM chip

[Luis Antoniosi (CoCoDemus)]

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>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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