Changes

# All power input are connected together via the 18-pin female header, output current is subject to the quantity of boards.

# You can use same one board to turn on/off all stackable boards. (be noted that which board you press the button to turn on, also must the same board to turn off.)

# MUST ALL 12 OFF jumper caps be shorted to disable 12V output when stacked multiple x-ups1 shields.

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