What models use "HP-48 style" enter?

[John Keith]

(03-10-2020 07:33 PM)Jake Schwartz Wrote:  Another shorter explanation might be from Bill's August 1987 HP Journal article "An Evolutionary RPN Calculator for Technical Professionals".

Jake

A very good reference, thanks!

For the benefit of other readers, two relevant quotes from the article:


The memory stack is a stack of 5-nibble object pointers,
not the objects themselves. The objects are stored either in
a temporary object area or in user variable memory. Thus,
when an object on the stack is duplicated, only the pointer
is duplicated.
___________________________________________________

The centerpiece of RPN keyboards has always been the
ENTER key. On previous calculators the ENTER operation
terminates digit entry, copies the contents of the X register
into the Y register, and then disables stack lift. On the
HP-28C, the concept of stack lift disable has been eliminated
(with an indefinite-depth stack, it serves no purpose
and would only add confusion), and the role of the ENTER
key has been generalized to mean "parse and evaluate the
command line."