RPN Calculator

collectingDigits

t
z
y
x

1	2	3
4	5	6
7	8	9
±	.	0
enter	drop	swap
+	-	×
÷	x²	dup
rot↑	rot↓	x←0
√‾	e^x	x←-x
y^x	log	x←1/x
clear	π	log₂

This isn't exactly what happens on an H/P calculator. When is the stack lifted?
Todo: Get rid of Enter, rename "dup" to "Enter".
$Id: rpn-calculator.html,v 1.1 2019-05-16 13:30:18-07 jel Exp jel $