[Coco] Artifacting (again)

[Mark McDougall]

Hi,

I'm looking for some information on basic (simple, 4-colour) artifacting on 
the Coco 1/2 PMODE 4 screen - NOT interested in the Coco 3 at this point.

I've seen the threads in which John has been asking about artifacting, but 
he's after the "extra" colours in particular. I just want to know about the 
back/white/red/blue scheme, and the links tend to "gloss over" the 
information I'm looking for.

Trouble is of course that I don't have a Coco1/2 to try this on either.

Is it simply something like this (starting on even columns) :

0 0 = black
1 1 = white(buff)
0 1 = red
1 0 = blue

Do both PAL and NTSC produce artifacts? And are there any differences 
between PAL/NTSC machines? Do you get artifacting on the green/black PMODE 4 
screen (SCREEN 1,0)?

TIA
Regards,

-- 
|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"