[Coco] CoCo 1/2 to VGA?

[Michael Graham]

On 03/08/2013 02:03 PM, Luis Antoniosi (CoCoDemus) wrote:
> I did it and posted here the schematics few weeks ago. Search for pristine
> image on coco1/2. But is a YCbCr your TV/monitor must support that in low
> resolution.
>
> On Fri, Mar 8, 2013 at 3:01 PM, Michael Graham <mkgraham at gmx.com> wrote:
>
>> So wait, does that mean you'd be able to get component video out of a late
>> model CoCo 2 with a few video amps?  I'd like to try that.  I mean, I doubt
>> it'd work on a modern LCD TV or anything, but I have a CRT TV and a CRT
>> monitor that can both take low-resolution component video and display it
>> quite well.  The monitor could probably do it even if it isn't quite at the
>> right standard (it's a Sony PVM and has lots of adjustments).
>>
>> -Michael
>>
>> On 03/08/2013 12:12 PM, John W. Linville wrote:
>>
>>> On Thu, Mar 07, 2013 at 12:43:13AM -0600, camillus Blockx wrote:
>>>
>>>> Well the rf modulater works with composite video. You can take that
>>>> signal
>>>> after amplified it and end it to 75 Ohm to feed your a/v device. Look on
>>>> google to find schematic for amp. Know for shure there is one that works
>>>> on
>>>> coco 2. Used it on my coco 2 myself.
>>>>
>>> That is true on the CoCo1, but not really true on the CoCo2.  On the
>>> CoCo2, the Y, R-Y, and B-Y signals from the 6847 go to the modulator.
>>> The MC1372 inside the modulator combines them into the NTSC RF signal.
>>>
>>> The CoCo1 uses an MC1372 as well, but only to generate NTSC composite
>>> video which is then fed to a separate RF modulator.  That is why it
>>> is easier to convert a CoCo1 to composite video out than it is to do
>>> so for a CoCo2.
>>>
>>> John
>>>
>>
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>
>