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This shield implements a pair of 320x240 true color image memories.

The memories alternate between being mapped into the Arduino MEGA address space and being scanned out by the CRT controller.

This allows drawing of the next image "behind the scenes" and improves the perceived performance of the system.

The memory map addresses the memories 8 bits at a time to match the Arduino data bus.

The CRT controller addresses the memories 24 bits at a time for true color output.

Arduino sketches can use the extra memory with minor additional code.

An example sketch is provided that shows how to use and test the memory.