In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Wow!
I finally understand why all the RB pins do wake up.
I had never thought that a matrix keyboard would be involved.

With 8 bits one could actually do 8X8 or 64 keys at maximum.

I seem to have been thinking I only needed one bit unless I was trying to do some complex robotic scheme.

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