Bye bye Prime

[walter b]

BTW, that definition / categorization is independent of the physical size and shape of the device under investigation. E.g. with the 43S, you'll get RPN on a multiline display.

And there is a test case to find out what you have (kudos to hansklav):

1 ENTER 2 ENTER 3 ENTER 4 ENTER 5 ENTER 6 ENTER 7 ENTER 8 ENTER 9 ENTER
+ + + + + + + + (8 times)

Now, if you get

• 68 then you've got type 1 (classic RPN) with 4 stack levels,
• 54 then you've got type 1 (classic RPN) with 8 stack levels,
• 45 then you've got type 2 (RPL) with a large ('infinite') stack,
• 60 then you've got type 3 with 4 stack levels.
  

d:-)