Need help programming HP-35s

[r. pienne]

Thanks for posting the photo.

The EQN indicator on the display shows that you are currently in Equation mode. That is used for entering a single algebraic expression (or a text message) while in RPN mode, and is activated by pressing the EQN key and ended by pressing Enter.

In your example, equation mode is only used for line A003. So, line A003 is entered by pressing EQN followed by RCL A RCL Z RCL I (etc) and terminated with Enter. The other lines are entered as indicated in the example.

Hope that helps a bit.

(Edit: Oops, Didier got there first! But the advice still applies)