Algorithm for entering numbers?

[grsbanks]

(08-12-2019 08:34 AM)Ángel Martin Wrote:  Interesting view, somehow it reinforces the notion that "LastX" is whatever was last in x before executing the function, regardless of wthat might be

Exactly, because the value in X is the one that's otherwise going to get clobbered by the operation, so this is the only way of bringing it back from the dead.

(08-12-2019 08:34 AM)Ángel Martin Wrote:  I guess I value more the consistency with the two-step approach ( RC+ = RCL , + ) just to be on the safe side.

I see where you're coming from, but the whole point of register arithmetic operations is that they mean you don't recall anything into the stack, thus preserving T as a positive side effect. In this respect, "RCL[op] nn" and "RCL nn [op]" are not functionally equivalent at all.