HP 35s Basic Programming 

You’re welcome, thank you for saying so!

@@west Really pleased to give credit where it's due. Decades after I should, I just bought one of these. Your tutorials really complement the manual! All the best. Dan.

That should be pretty straight-forward, you're just going to have to write a program and store the x and y variables. Something like this: LBL V STO A XY STO B x RCL A RCL B + / END So it would store the x-stack into the variable A, then swap x and y and store the (old) y-stack into the variable B. Multiply them together for your numerator, recall them both and add them for the denominator, then divide. To execute it just XEQ V (or whatever label you picked) and it will do the voltage divider on the values sitting in the x and y stack.

LBL V 1/x xy 1/x + 1/x END

I got curious how to program this using just stack information and without using STO. I'm a newbie at this, so there may be a better way to perform this. LBL V REGY REGY + (add) Roll Down x (multiply) Roll Up / (divide) It seems recalling from stack also raises the stack up. At the beginning, double REGY just copies X and Y stack because they are used in the equation twice. To access the registers for programing, or just looking at them, on the HP35s: Left Shift(Yellow) and open a menu(Flags, Display, Const, Mem), press Roll Down, look at stack registers, press enter on one to select For any DM42(and presumably HP42), to STO and RCL stack registers: press STO/RCL and press . (decimal button)

In RPN mode it would be the exact same sequence of keystrokes. Key in your first number. Hit x^2. Key in your second number. Hit x^2. Hit +. Hit the square root symbol.

That's correct! It took a long time to enter...

Are you in decimal mode or could you be in say octal or hexadecimal mode, in which decimal numbers are invalid?

Is it a 35s program or for another HP calculator? The 35s doesn't have a direct function to convert from rectangular to polar so you might have to run it through another function. Converting from rectangular to polar isn't hard, but it's a few extra steps.

Yeah I just found out it's for a hp33 not the 35.

It's three programs. One for stacking, traverse and inverse.

Scalvenger no. only a to z.

27 if you don't label the 1st program in memory...

No, but you can use GTO to run programs that have no label or are in between labeled programs.