[Coco] CoCo 3 to RBG...

[Steve Batson]

No kidding about this getting more confusing as we go. At first, when I 
didn't get mine working after the first pass, I figured I probably have a 
bad connection or didn't wire it right. And I haven't had a chance to get 
back and double check my connections to make sure everything is correct. 
With the other people here having issues, I know it's not just me ;)

Seems pretty straight forward when you look at the connectors on this board 
and the CoCo. If the CoCo is not putting out the proper signals/levels for 
this board, then it's not standard RGB I would think...but it works with 
the CM8 as well as a Magnavox RGB monitor, so I'm suspecting it is a 
Standard RGB output requiring just the proper cable to go to the monitor. 

That said, I'm more inclined to think that the board is the issue and 
meeting it's requirments is not as obvious as it should be...and the skimpy 
manual doesn't help matters. My electronics background doesn't include much 
video, so while I can follow much of what's been said in this thread, I'm 
not in a position confirm or deny anything that's been said. I am going to 
keep toying with my setup to see if I can get it working, but I'm also 
anxious to see what others here find out.

----------------------------------------

From: "Steven Hirsch" <snhirsch at gmail.com>
Sent: Thursday, July 21, 2011 5:16 AM
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Subject: Re: [Coco] CoCo 3 to RBG... 

On Wed, 20 Jul 2011, Steve Batson wrote:

> Steve,
>
> If I understand your message here, you are saying that using the 15 Pin
> connector may be the better way to go because it has all the proper 
signals
> on it where the on board connector does not. Is this correct?

Heh. No, this just keeps getting more confused :-). I KNOW that P3 does 
not bring out anything but a composite sync input. I BELIEVE (but haven't 
had time to ring it out) that P11 and P12 are electrically connected to 
the same circuit nodes to the extent that their defined signals intersect. 

VGA style connectors do not typically present an input for composite sync, 

so P11 may have that addition beyond what's on P12. I'll try to make time 
today to put an ohmmeter on it and verify.

Steve

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