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Crystal is 8 MHz! The demo code uses PLL 16X giving a 128MHz
clock speed! This seems borderline... Some people have found
they have to drop to PLL 8X when using multiple cogs or assembly code.
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It appears that the controller IC for the display (the long thin
rectangle mounted directly under the display and connected by flexible
data cable) is the SSD1331 from
http://www.solomon-systech.com
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Here's a datasheet for the SSD1331
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