While the CPU unit is self contained and has nibble input slide switches, I knew that universal appeal for this machine would only come with a spanky cool pushbutton keypad. I broke several fingernails sliding those switches and that was the last straw! I make this cool addition(no pun intended) to make entering those pesky single digits more fun.
That is a serious pretty in the mouth keypad is it not? I have yet to apply the labels but will get there soon.The blue key is function-press to toggle. The yellow is equals key. It gives you the answer you so desperately seek! The last red key is clear.....ya gotta have a clear button.