[Coco] Documentation of "complex" artifacting (i.e. more than black/white/blue/red)?

[Joel Ewy]

Brian wrote:
> Hi John,
>
> On my website there's a link to a Rainbow article on artifacting.
>
> http://coco.randomrodder.com
>
> Sent from Brian's iPhone
>
> On May 21, 2010, at 5:05 PM, "John W. Linville" 
> <linville at tuxdriver.com> wrote:
>
>> Are there any articles in Rainbow or similar CoCo-oriented publications
>> that documented use of "complex" artifacting for producing additional
>> colors (e.g. purple, green, etc) with a CoCo?  Can anyone refer me
>> to one?
>>
>> There was a thread on the list back in July of 2004 that touched on the
>> issue, but other than some sample programs for testing there wasn't
>> much discussion of the technique or how to exploit it.  It looks
>> to me that unlike the "simple" artifacting (which exploits the NTSC
>> color signal itself), "complex" artifacting relies on the physical
>> characteristics of a CRT display and possibly on some sloppiness in
>> the video hardware on the CoCo itself...?
>>

Well, the effect does show up on a video capture card, so it is present 
in the NTSC signal, not just in the CRT.  It may be that sloppiness in 
the CoCo video circuitry is responsible, but it's not an effect that 
takes place in the picture tube.

JCE

>> Anyway, if you have any more concrete info on this mode I'd love to
>> see it.  The technique is supported in the MESS source code, but it
>> is a bit indecipherable... :-(
>>
>> John
>> -- 
>> John W. Linville        Someday the world will need a hero, and you
>> linville at tuxdriver.com            might be all we have.  Be ready.
>>
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