[Coco] COCO 2 to VGA

Phill Harvey-Smith afra at aurigae.demon.co.uk
Tue Dec 29 18:40:14 EST 2009

Louis Ciotti wrote:
> On Tue, Dec 29, 2009 at 4:29 PM, Phill Harvey-Smith
> <afra at aurigae.demon.co.uk> wrote:
>> The Acorn Atom also uses the 6847, so this may also work with CoCo
>> 1/2/Dragon machines.
>> The Acorn colour conversion board schematic is here :-
>> http://www.stairwaytohell.com/temporary/atom_pcb_atomcolourboard.gif
 > Now that looks promising...

It is worth noting that I think about half  of that circuit is timers 
and the like to try and convert a 60Hz signal into a 50Hz signal, the 
Dragons have a similar bunch of counters to do the same. So if you where 
using it with a 60Hz capable RGB monitor, the it could probably be ommitted.

Also I guess some of the logic could be combined into a PLD/CPLD.



Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.

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