[Coco] How do you hook up a CoCo 3 to an Amiga 1080 Monitorusingthe Analog RGB Port?

[Bert & Peggy Schneider]

Bob,

Thanks for your offer to help.

I originally just hooked up my CoCo 3 (from a 10 pin dual in line
connector) to the Amiga RGB port (DB9 connector) with the following
connections:

CoCo 3 RGB Connector	Signal	Amiga Monitor Connector
1				Ground	1
3				Red		3
4				Green		4
5				Blue		5
8				HSYNC		8
9				VSYNC		9

Nothing happens in the analog or digital RGB modes in this
configuration.

Then, I discovered that in the RGB Analog mode, the 1080 required a
composite sync (according to the documentation I found on the Internet -
I could be wrong)

CoCo 3 RGB Connector	Signal	Amiga Monitor Connector
1				Ground	1
3				Red		3
4				Green		4
5				Blue		5
8				HSYNC --+
9				VSYNC --|-- 7 - CSYNC

Note that I took pins 8 and 9 from the CoCo 3 and connected those to a
composite sync circuit.  Here is the link for a schematic:

http://www.tkk.fi/Misc/Electronics/circuits/vga2rgbs.html

I built the TTL level sync signal.  I made a stand alone box with a 5V
supply using a 9 volt battery, an on/off switch and a status LED.

All I get with my circuit is an image that is on a diagonal.  Of course,
the composite video input of the 1080 works great.

Any help would be appreciated.  What I really need is a good schematic
and/or description of the Amiga 1080 monitor inputs.

And, oh by the way, if I do get this thing to work, I will share my
schematic, if you are interested.

Thanks

Bert

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com]
On Behalf Of Bob Devries
Sent: Sunday, July 09, 2006 7:58 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] How do you hook up a CoCo 3 to an Amiga 1080
Monitorusingthe Analog RGB Port?

Bert,

Please describe the trouble you're having in more detail.

I *know* I hooked up my coco3 to a Commodore 1084 monitor with very
little 
problem, but I forget details right now. Of course, the 1080 may be 
different, but I don't have a schematic. Maybe Gene can throw some light
on 
this?

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Bert & Peggy Schneider" <bertnpeggy at comcast.net>
To: "'CoCoList for Color Computer Enthusiasts'" <coco at maltedmedia.com>
Sent: Monday, July 10, 2006 12:27 PM
Subject: [Coco] How do you hook up a CoCo 3 to an Amiga 1080 Monitor 
usingthe Analog RGB Port?


>I bought an Amiga 1080 multi-sync monitor via E-Bay to hook up to my
> CoCo 3.  I noticed that the analog mode requires a composite sync.  I
> built a simple circuit to combine the horizontal and vertical sync
> signals of the CoCo 3 using a 74LS86, but I'm still having trouble.
Any
> suggestions?
>
> Thanks!
>
> Bert
>
>
>
>
>
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco 


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