Arduino powered 7seg led display with Port Manipulation

Time for something a little more advanced. Direct Port Manipulation. Normally when using Arduino software, the actual logic behind changing the values in pins is abstracted away with digitalRead and digitalWrite. Now, for most people that's just fine. But it has some limitations. For one, it is a little slower than might be practical for some situations and it can only change one pin at a time. But what if ...

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