[Coco] Will the *real* artifact colors please stand up?

[Kevin Diggs]

Hi,

	Are the results of this artifacting business in any dependent on the
quality of your TV (i.e. crappy tuner Vs one with 3d digital comb
filter)?

					kevin

John Kowalski wrote:
> 
> I was playing Sea Quest on Brad Grier's excellent Mocha emulator the other
> day and noticed that the grass in the adventure was showing up as purple
> instead of green (using complex artifacting).
> 
> Naturally, I assumed I made a mistake in the complex artifacting algorythm
> and asked Brad to swap the green and purple colors - and he did.
> 
> Then I pulled out a *real* CoCo 1 and tried playing the same game...  And
> the grass showed up as purple instead of green!   What the...!!??
> 
> I then tried other PMODE4 games that used complex artifacting and things
> like grass did show up as green!
> 
> ...Which leads me to my question...  Are the rarely used artifact green and
> purple colors the same on all CoCo 1s?   Do the patterns that show up as
> green and purple on one CoCo end up showing as other colors on other CoCos?
> 
> Could anyone who has a CoCo 1 please type in this short program and write
> back what colors you see:
> 
> 10 PMODE4,1:PCLS:SCREEN1,1:PMODE3,1:A=2:B=2.5
> 20 FORY=48TO143:FORX=(Y AND1)+65TO191STEP4
> 30 COLORA:PSET(X,Y):COLORB:PSET(X+2,Y):NEXT
> 40 A=A+1/48:B=B+1/48:IFA>3.5THENA=1
> 50 NEXT
> 60 GOTO60
> 
> On my CoCo 1 the program displays 4 bars of color - red,green,blue and
> purple  (or blue,purple,red and green depending on the CoCo's mood.)
> 
> Please write back and tell me which four colors you see on your CoCo, and
> what model CoCo you're using.
> 
> (Don't bother with a CoCo 3 - the green and purple bars will likely just
> show up as grey and grey.)
> 
>                                          John Kowalski (Sock Master)
>                                          http://www.axess.com/twilight/sock/
> 
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