One last bit...

I found this set of instructions on
http://landover.no-ip.com/pet/forum/index.php?topic=196.0

"...This is a relatively simple change. ...To go from PAL to NTSC you 
need to swap the MOS 6569 for a 6567, close LK5, open LK4, and swap the 
crystal at Y1 for the 14.31818MHz one. Lastly make the color adjustment 
with the small trimmer until you get good color. Make the adjusments 
VERY SLOWLY with a non-metallic tool. .."

Bill


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