Quote:

See page 3-6 of the user's manual. STO + A will add the value in X to A. RCL + A will add the value in A to X.

But, not in ALG mode.

Using the procedures on pages 3-6 through 3-8 of the HP35s User's Guide and operating from the keyboard:

In RPN Mode the sequence:

2 STO A

3 STO+ A

RCL A

yields 5 in the display.

In ALG Mode the sequence

2 STO A ENTER

3 STO+ A ENTER

RCL A ENTER

yields 3 in the display and, looking at what happens as the sequence is keyed in, nothing happens in response to the entry of the + after the second STO of the sequence.

However, *there are blue check marks* by each section heading on pages 3-6 and 3-7, and if one has read the manual from the beginning one will know from page 1-1 of the manual that a blue check mark "... identifies examples or keystrokes that are shown in RPN mode and must be performed differently in ALG mode."

Is it that "storage arithmetic" and "recall arithmetic" are not available in ALG mode, or is it simply that I don't know how to do it? I do understand that one can recall the contents of a register, add something to it and return the result to the original register, but that is not what is commonly known as "Arithmetic with Stored Variables".

The HP33s provides "Arithmetic with Stored Variables" in both RPN and ALG modes. The text and examples on pages 3-4 to 3-6 of the HP33s User's Guide are nearly identical to that on pages 3-6 to 3-8 of the HP35s User's Guide, but there are no blue check marks on those pages of the HP33s User's Guide.