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broken double hires



Which parts of my Platinum //e are responsible for the double 
hires graphics?
It's not working anymore. Yesterday (maybe last month) double 
hires was running fine, now the screen is missing the half of the 
pixels.
The orig. (small) Apple 80 col/64KB card is ok, I tested it with 
another _simple_ //e.
Are there chips in the Platinum to change and so repair the double 
hires. I think everything else is working fine.

Stephan