|Re: What impresses my about the 33S|
Message #3 Posted by bill platt on 14 Apr 2004, 3:14 p.m.,
in response to message #2 by Ron Ross
Hi Eddie, (and also hello Ron!)
The 17bii+ manual is also taken directly from the 17bii -- also a Corvallis product.
Your observation about ENTER being like "DUP" in the 48--that is true. But you give yourself away as a non-RPN person! (that is OK BTW). The 33s is "classic" RPN. The 48 is "RPL" which is a language rather than a notation. In a 48, there is a "command line" and then ENTER puts anything on the command line into level 1. If nothing is on the command line, then it will push the stack and DUPlicate level 1 into level 2.
An RPN stack does not have a "command line." Rather, any time you start typing, you are in the 1st stack level (called "x"). ENTER will push the stack, and duplicate your value into level 2 (called "y"). The stack is X--y--z--t.
Because RPL (28 and 48 series) allows operations between the "command line" and level 1, it behaves almost identically with RPN, with a few exceptions. The most notable difference is as you noted--On an RPL machine, you have to push ENTER twice after typing a number, in order to get it into the 2nd level. This means that on an RPL machine, to manually "square" a number, you go "v" ENTER ENTER *. But in RPN, all you have to do is "V" ENTER *.
Be careful with one thing in RPN mode on the 17bii series---after a master clearing or switch from ALG, the stack will be only one level deep to begin with, and will not feed a constant----see the Museum, and also Craig Finseth's site for a good description of this quirk. (BTW it also happens to the "history stack" wneh you come bact to ALG out of RPN).