Input to the stack

The operands are stored as floating-point numbers in the floating-point stack of the calculator.

The most recent elements are entered in the x register, which lies at the bottom of the stack. New elements are entered there, pushing up the entire stack.

If the stack overflows to 10 numbers, the oldest element is lost.

digits
0,1,2...9 used to enter mantissa and exponent figures

< used to delete the last character entered

. The decimal point (.) used in the mantissa

E and E- used to start writing the exponent (E for positive exponents,
E- for negative exponents)

+/- changes the sign of the floating-point number in x

Enter stops the editing of x register and pushes the stack up, so that the x register is free to receive a new floating-point number

drop removes the content of the x register, and pulls the stack down

digits 0,1,2...9	used to enter mantissa and exponent figures
<	used to delete the last character entered
.	The decimal point (.) used in the mantissa
E and E-	used to start writing the exponent (E for positive exponents, E- for negative exponents)
+/-	changes the sign of the floating-point number in x
Enter	stops the editing of x register and pushes the stack up, so that the x register is free to receive a new floating-point number
drop	removes the content of the x register, and pulls the stack down