The first sign of HP-35’s ln(2.02) bug

[teenix]

(09-09-2022 06:25 AM)RMollov Wrote:  why is 1 enter + = 2

It's all to do with how the 4 level stack works.

All cleared

T 0
Z 0
Y 0
X 0 Displayed value


Key = 1, T is lost, Z -> T, Y -> Z, X -> Y, 1 -> X

T 0
Z 0
Y 0
X 1 Displayed value


Key = ENTER, T is lost, Z -> T, Y -> Z, X -> Y, X = No Change

T 0
Z 0
Y 1
X 1 Displayed value


Key = +, Y + X -> X, Z -> Y, T -> Z, T = No Change

T 0
Z 0
Y 0
X 2 Displayed value


Examples

T 12
Z 4
Y 9
X 2 Displayed value

Key = -, Y - X -> X, Z -> Y, T -> Z, T = No Change

T 12
Z 12
Y 4
X 7 Displayed value

Key = x, Y x X -> X, Z -> Y, T -> Z, T = No Change

T 12
Z 12
Y 12
X 28 Displayed value





Lots of info on the stack and RPN in the user manual and could be on rear calculator label.

cheers

Tony