[Coco] VGA Questions??????????

Brendan Donahe brendan at polylith.com
Tue Aug 21 16:52:44 EDT 2018

I have no personal experience with Roy's VGA adapter, but it is my
understanding that it adapts CoCo 3 RGB output to VGA.  The CoCo 1 has no
such RGB output, therefore it is incompatible with this solution.

The Switcharoo as well as Richard Lorbieski's RGB to SCART cable are also
intended only for the CoCo 3.  If you do not have a monitor or TV with a
SCART input, you would need a SCART-to-HDMI adapter.

A joint project between me, Ed Snider, and Steve Spiller called CoCoVGA is
compatible only with some CoCo 1, 2, and Dragon systems, including the F
board CoCo 1.  It plugs in in the same socket where your video chip is
currently installed.  You can find out more at www.cocovga.com.  I
understand that commercial VGA-to-HDMI solutions exist that work with
CoCoVGA, but have not tried any.

As far as I know, there are no solutions which provide common output types
which work on both the CoCo 1 and CoCo 3 except for composite output or the
RF (tuned to channel 3 or 4).

All of these (except Roy's, I think) can be found on this page:


Hope this helps,

On Tue, Aug 21, 2018 at 3:12 PM, Joe Schutts via Coco <coco at maltedmedia.com>

> Hi Everyone,
> I have (what I expect) are some dumb questions. I have a couple of
> questions regarding the CoCo 1 and 3 on BOTH a VGA as well as a HDMI
> Display.
> First off, I have 2 of Roy Justas's VGA Adapters (which I haven't had an
> opportunity to use as of yet), I SHOULD also have 1 OLD CoCo "Gray Case" 1
> "F" Board (64k) and a CoCo 3 (512k which I eventually plan on upgrading to
> 2meg). I also have 1 MPI (white case 3024 model) which I am not sure if it
> has been modified for the CoCo 3 or not (but I will upgrade it once I get
> both of my CoCo's here with me.
> Now the reason I haven't tried any of these solutionsm is that I live in
> PA and (I think - or HOPE they both SHOULD) both are hopefully in Maryland
> at my cousins house and haven't had a chance to get down there and get
> them. Right now the only CoCo item I do have is the MPI and both Roy
> Justas's VGA Adapters, so I have NO WAY to test them (as of yet).
> What I need (or want) to know is which one of these 3 ways to connect BOTH
> the CoCo 1 and the CoCo 3 give the clearest display on both a VGA Display
> (on BOTH a 32' TV and a 21' VGA Monitor) as well as a HDMI Display on a
> HDMI TV or Monitor.
> 1. First, there is the option of using Roy Justas's VGA Adapter, which I
> already have two of. (Again, which I haven't tried as of yet).
> 2. Then, there is the other adapter (I'm not sure if it's called
> "RGB2VGA") or something like that. I'm also not sure if this is
> SPECIFICALLY JUST for the CoCo 1 (and WHICH Board or Boards) and also the
> CoCo 2 OR if it will also work on a CoCo 3 or not.
> 3, Then there is the last option of using the other Adapter that uses both
> the "Switch-A-Roo" Adapter along with a SCART Adapter (which is bought
> separately) which I believe is ONLY for the CoCo 3 (although I could be
> wrong about this).
> Now (like I said) I need to know which one of these 3 options (or
> Adapters) will give me the clearest picture (in BOTH "Text" AND "Graphics"
> modes) on both the CoCo 1 and the CoCo 3???
> Anyway, this is what I would like the answers to...
> I apologize if these questions have already been asked but I didn't see
> them if they were...
> Thanks again for your help in this matter...
> Joe...
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