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Why always SPI CS on pin 10?

Thank you, Ladyada, for this great display.

But why is TFT CS on pin 10?

Bildschirmfoto 2016-03-03 um 21.48.49

Pin 10 is also the SPI CS for the Ethernet shield. Why not, for instance, pin 6:


Carefully lift pin 9 of the level shifter and connect it using a thin wire with pin 6 of the Arduino connector.

And voila, both the display and the ethernet shield is working: