[Coco] CoCo 3 to RBG...

[gene heskett]

On Wednesday, July 20, 2011 01:00:14 PM Steve Batson did opine:

> Steve,
> 
> Can you provide details on building your 2 chip circuit to get it
> working?
> 
> I received mine this week, built cables to Map Coco 3 RGB signals to the
> on board 8 pin connector as they describe. The board powered fine, I
> can access it's menu and functions, but no Coco output. Just a green
> screen, but I don't think it's Coco output though. Coco works fine with
> composite  out to TV.
> 
> Any help will be appreciated!  :)

This is going to be best troubleshot with a decent scope, only that can 
give you a definitive answer.

Oh Wait, you said the 8 pin connector?  Humm, I may be half a bubble off 
here, but ISTR reading in the excruciatingly fine print (I had to drag out 
an old projector lens & use it for a magnifying glass to read that teeny 
little booklet) that the 8 pin connector only handles 31khz & up sources, 
so I had not considered doing anything but stuffing the coco's signals into 
the adjacent DB15, which claims to work down to 15 khz, and which means one 
must pay attention to the pinout of the 10 conductor cable from the coco as 
to where it goes in the DB15.  I have printed out the usual vga pinouts, 
and can look the coco's signals up in the manuals, but do not have a DB15 
male to use ATM, so I haven't yet warmed up my iron.  I need to stop at the 
shack & see if they even have that stuff anymore. :(

Maybe that is your problem, Steve?

[snip old text]

Cheers, gene
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