HP-41 and 42s: AIP with or without sign?

[Dieter]

(06-06-2018 08:00 PM)rprosperi Wrote:  if someone wanted to preserve the sign it's a pain to check absolute value and prepend the "-" sign while preserving the stack values prior to AIP, while on the 42S a simple ABS would remove it.

Well, it's not that much of a pain even with the Advantage Pac's AIP:

X<0?
>"–"
AIP

Doing it the HP-41 way on a 42s while preserving the stack (but not LastX) would require something like this:

ABS
AIP
X<> ST L

But anyway, I prefer the 42s implementation. And I wonder if this difference ever has been mentioned somewhere as a possible problem when transferring HP41-code to the 42s.

Dieter