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

[Bob Devries]

There's a distinct possibility that the SYNC signals need to be inverted 
with a 7404 type gate (invertor). Try that on either or both the HSYNC and 
VSYNC signals, and see if it works.

--
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: Tuesday, July 11, 2006 12:53 PM
Subject: RE: [Coco] How do you hook up a CoCo 3 to an Amiga 
1080Monitorusingthe Analog RGB Port?


> 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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