[Coco] Re: [Color Computer] Tech Question Forwarded from the Coco3.com Forums

[mspencer712]

I posed the original question on CoCo3.com, and someone there helped
me find this mailing list.

Yes, that fixed my problem.  Thank you VERY much for such a quick
response.

Now it looks like I have a LOT of message history to catch up on.  :-)

--Michael Spencer

--- In ColorComputer at yahoogroups.com, Mike Pepe <lamune at d...> wrote:
> 
> 
> Mannequin* wrote:
> > 
> >>I just dug my CoCo2 out of a box, to do some timing/behavior
validation for
> >>the Daggorath PC port. The machine still works, and my original
Daggorath cart
> >>still works (yay), but there's a LOT of noise in the video image
on the TV I'm
> >>using. I'm connecting using an old RF adapter originally shipped
with the
> >>Nintendo Entertainment System, and I seem to remember it working
with this
> >>adapter before.
> > 
> 
> His problem is most likely due to the fact that the NES switchbox is 
> most likely the electronic/automatic one and not one with a mechanical 
> switch.
> 
> The NES switchbox needs some DC power fed along the cable with the RF 
> signal to actually switch from the antenna input to the game input. 
> Without this DC power, all he's getting is likely radiated RF noise
from 
> the cable itself.
> 
> I would go to Radio Shack (yes, they still have some uses!) and get a 
> piece of 75 ohm coax cable and an F to RCA adapter, and plug the CoCo 
> directly into the antenna input of the TV. (or alternately use a coax 
> a-b antenna switch) for best results.
> 
> Those RF cables that came with the CoCos suck. Also since they
tended to 
> get lost a lot of people have been using audio cables which really 
> aren't intended for that purpose. The piece of antenna coax is probably 
> the best way to go.
> 
> -Mike








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