[Coco] Artifacting (again)

[Arthur Flexser]

On Wed, Sep 1, 2010 at 6:54 PM, Rob Rosenbrock <rob.coco at zaphod.tzo.com>wrote:

> >
> > I notice dmkeil's Coco 2 emulator page shows Clowns & Balloons with
> red/blue artifacting, whilst L. Curtis Boyle's page shows it with
> orange/cyan colours?!?
>
> I've always noted that no two televisions have the same picture. Possibly
> they emulated the artifacting to match what they saw on their own monitors.
> After all, it is an illusion of color.
>
>
I think the explanation of the discrepancy is rather due to the fact that
the CoCo 1&2 had two different modes of displaying the artifact colors,
randomly determined after a restart or the pushing of the reset button.
Some games instructed you to begin by repeatedly pressing reset until the
initially displayed screen appeared as orange rather than blue (or vice
versa), so that the artifact colors would appear the way the game's author
intended.  On the CoCo 3, in composite mode only, this was emulated
by holding down F4 (I think) before pressing reset to cause the color mode
to flip to the alternate one.

Art