Today I finished writing up my description about using the Arduino as a 5 MSPS oscilloscope.
It is going a bit more low level in programming the Arduino, and read out an external ADC as fast as possible.
Describing some of the challenges one is faced with in more detail.
Link to the project: https://digibird1.wordpress.com/arduino-as-a-5m-sample-osciloscope/
digibirds side 
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