roll up stack

[Steve Simpkin]

[XEQ ] [ALPHA] [R] [SHIFT] [ENTER] [ALPHA]
[/quote]

Thanks. Is there a place to look this up? I did search quite a bit before posting.

Also, while fooling around, I assigned my arrow key (below alpha) to something. What is the default?
[/quote]

Yes and no. Roll Up is one function that I find poorly documented in the otherwise excellent HP-41C manuals. For any function that is not on the keyboard you need to know the alpha name of that function to execute (XEQ) it or assign it to a key. The alpha name of many HP-41C functions are spelled exactly that same as the function itself, for example SIN, LOG, LN, STO etc. You can hold down any key for a few seconds to see its alpha name before it NULLs out. Other names are less obvious.

The alpha name for the R↓ key (Roll Down) is RDN. From that you might conclude that the alpha name for the Roll Up function would be RUP. You would be wrong. The alpha name for the Roll Up function is R↑. You have look in CATALOG 0 or in the function index in the back of the manual to find that alpha spelling. To compound matters, the ↑ symbol is not printed anywhere on the alpha keys on the calculator itself. You have to look at the back of the calculator to see that the ↑ character is entered using Shift ENTER. Thus you have to enter [XEQ ] [ALPHA] [R] [SHIFT] [ENTER] [ALPHA] to execute R↑ or enter the R↑ function in a program.

Edit: Of course you could do a Google search for "roll up on the HP-41C" but that option did not exist when the HP-41C models were in production (1979-1990).

The above information is also in the HP-41CX Quick Reference Guide.

Edit: Typos.