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Can we have RPN back?
03-28-2014, 03:34 PM
Post: #44
RE: Can we have RPN back?
(03-27-2014 04:08 PM)orcinus Wrote:  ...Edit: On top of that, RPL is a natural extension of RPN. No one's forcing you to use >4 stack levels.
Arguably, this is true. I like the extensions. However, RPL (Entry RPN) isn't a fully compatible extension of legacy RPN. That's what the OP was asking for: a compatible legacy RPN mode for Prime. I don't want it, but I understand the request.

The two major differences are (I believe):
  • Behavior of stack lift. Starting with an empty stack, "2 [Enter] x" results in 4 on legacy RPN calculators and an error on RPL calculators (and the Prime).
  • Auto-copy of T. As operators consume the contents of the stack, on legacy RPN calculators, the contents of T is duplicated into Z so that the stack never truly empties. (In fact, the stack always contains 4 numbers.) On RPL machines, the stack can actually empty, resulting in operation not being able to complete for lack of arguments.
Of the two, I think the first is the most important behavioral attribute to the legacy RPN crowd. I've taken advantage of the behavior on the 35/67/97/41 myself, but I think the more recent behavior is more internally consistent, even though (gasp) it takes an additional keypress for some operations.

- John
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Messages In This Thread
Can we have RPN back? - Tugdual - 01-26-2014, 10:24 AM
RE: Can we have RPN back? - Thomas Radtke - 01-26-2014, 05:42 PM
RE: Can we have RPN back? - Tim Wessman - 01-26-2014, 07:29 PM
RE: Can we have RPN back? - Tugdual - 01-26-2014, 05:45 PM
RE: Can we have RPN back? - Craig Thomas - 01-26-2014, 06:23 PM
RE: Can we have RPN back? - Joe Horn - 01-27-2014, 03:58 AM
RE: Can we have RPN back? - Thomas Radtke - 01-27-2014, 06:32 AM
RE: Can we have RPN back? - Joe Horn - 01-27-2014, 07:56 AM
RE: Can we have RPN back? - Thomas Radtke - 01-28-2014, 06:14 AM
RE: Can we have RPN back? - Tugdual - 01-26-2014, 07:02 PM
RE: Can we have RPN back? - Tim Wessman - 01-26-2014, 07:47 PM
RE: Can we have RPN back? - orcinus - 03-27-2014, 02:31 PM
RE: Can we have RPN back? - Tim Wessman - 03-27-2014, 03:58 PM
RE: Can we have RPN back? - Han - 01-26-2014, 08:57 PM
RE: Can we have RPN back? - John R. Graham - 02-09-2014, 02:50 PM
RE: Can we have RPN back? - Craig Thomas - 01-26-2014, 11:53 PM
RE: Can we have RPN back? - Mark Hardman - 01-27-2014, 01:03 AM
RE: Can we have RPN back? - Craig Thomas - 01-27-2014, 06:45 AM
RE: Can we have RPN back? - Tugdual - 01-27-2014, 09:24 AM
RE: Can we have RPN back? - Ivan Rancati - 03-28-2014, 06:29 PM
RE: Can we have RPN back? - Thomas Radtke - 03-28-2014, 06:41 PM
RE: Can we have RPN back? - Craig Thomas - 03-30-2014, 06:24 AM
RE: Can we have RPN back? - Tim Wessman - 01-27-2014, 03:45 PM
RE: Can we have RPN back? - rlinden12 - 02-04-2014, 11:28 PM
RE: Can we have RPN back? - Thomas Radtke - 02-05-2014, 06:28 AM
RE: Can we have RPN back? - Joe Horn - 02-05-2014, 10:01 PM
RE: Can we have RPN back? - Craig Thomas - 02-06-2014, 12:31 AM
RE: Can we have RPN back? - Steve Simpkin - 02-06-2014, 01:40 AM
RE: Can we have RPN back? - Steve Simpkin - 02-09-2014, 11:43 PM
RE: Can we have RPN back? - Han - 02-10-2014, 01:53 AM
RE: Can we have RPN back? - John R. Graham - 02-10-2014, 04:26 PM
RE: Can we have RPN back? - Han - 02-10-2014, 08:00 PM
RE: Can we have RPN back? - John R. Graham - 02-10-2014, 08:47 PM
RE: Can we have RPN back? - Steve Simpkin - 02-10-2014, 08:58 PM
RE: Can we have RPN back? - John R. Graham - 02-10-2014, 09:51 PM
RE: Can we have RPN back? - Tim Wessman - 02-10-2014, 10:00 PM
RE: Can we have RPN back? - John R. Graham - 02-10-2014, 10:14 PM
RE: Can we have RPN back? - Tim Wessman - 02-10-2014, 10:23 PM
RE: Can we have RPN back? - John R. Graham - 02-11-2014, 10:53 PM
RE: Can we have RPN back? - orcinus - 03-27-2014, 04:08 PM
RE: Can we have RPN back? - John R. Graham - 03-28-2014 03:34 PM
RE: Can we have RPN back? - orcinus - 03-28-2014, 11:42 PM
RE: Can we have RPN back? - John R. Graham - 03-29-2014, 03:05 AM
RE: Can we have RPN back? - HP67 - 03-30-2014, 07:05 AM
RE: Can we have RPN back? - Jake Schwartz - 03-27-2014, 06:06 PM
RE: Can we have RPN back? - Tugdual - 03-29-2014, 12:21 AM
RE: Can we have RPN back? - orcinus - 03-29-2014, 12:45 AM
RE: Can we have RPN back? - Tugdual - 03-29-2014, 07:16 AM
RE: Can we have RPN back? - HP67 - 03-30-2014, 07:07 AM
RE: Can we have RPN back? - Joe Horn - 03-30-2014, 09:40 AM
RE: Can we have RPN back? - orcinus - 03-29-2014, 05:00 AM
RE: Can we have RPN back? - John R. Graham - 03-29-2014, 11:53 AM
RE: Can we have RPN back? - orcinus - 04-02-2014, 09:26 PM
RE: Can we have RPN back? - HP67 - 03-30-2014, 09:45 AM
RE: Can we have RPN back? - RyanB - 03-30-2014, 04:35 PM
RE: Can we have RPN back? - HP67 - 03-30-2014, 04:42 PM
RE: Can we have RPN back? - Joe Horn - 03-31-2014, 03:37 AM
RE: Can we have RPN back? - Han - 03-31-2014, 04:00 AM
RE: Can we have RPN back? - HP67 - 03-31-2014, 06:19 AM
RE: Can we have RPN back? - Thomas Radtke - 03-31-2014, 06:32 AM
RE: Can we have RPN back? - RyanB - 03-30-2014, 07:20 PM
RE: Can we have RPN back? - Matt Agajanian - 03-30-2014, 08:02 PM
RE: Can we have RPN back? - Tim Wessman - 03-31-2014, 03:01 PM
RE: Can we have RPN back? - Steve Simpkin - 03-31-2014, 04:22 PM
RE: Can we have RPN back? - Matt Agajanian - 04-02-2014, 05:31 PM



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