I will start the RPN nixie calculator with this keyboard design. There is 
now one additional column. Please let me know if you see any errors or if I 
forgot something essential for a RPN calculator. The calculator will not be 
programable. I want to make my own thing and not a HP clone, that’s why I 
keep using some keys like C, AC or MC.
[AC] clears the stack, [MC] clears the memory, [C] clears the display (x 
register) and [←] clears the last digit entered. The rest should be 
straight forward.

[image: RPN_keyboard.jpg]

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