stack lift and change sign

[Paul Dale]

(08-31-2014 08:50 PM)walter b Wrote:  On the 42S, ENTER always duplicates - on the 48, ENTER only duplicates if the entry line is empty. Personally, I prefer a function doing the same always (remember you've no chance to follow that weird behavior of ENTER on a single line display).

ENTER isn't a great example of the problems, subject to stack size, both entry systems behave similarily. However, ENTER on a classic RPN putting the new value in X and Y is inconsistent. That doesn't make sense and is truly weird on a single line display (or even a two line display).

What about Clx, Sigma+, Sigma-? They all disable stack lift. They introduce an inconsistency which simply wouldn't occur without the stack lift kludge.

CHS sometimes sets lift and sometimes doesn't. This is essentially the same as ENTER duplicating or committing a command line -- so a lift less device has the same problem twice whereas a classic RPN has two different ones.


Just because we've always done it one way doesn't make that way right or even good.


Pauli