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Old 22 April 2021, 16:36   #3
Jope
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,876
Amiga test kit CIA timer test is a good place to start with.

If it fails, see whether you have vsync/hsync on the CIA timer pins.

If only one of them fails, power down, swap the CIAs around, see if the problem follows the CIA.
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