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RPL is a [[structured programming]] language based on RPN, but equally capable of processing [[infix notation|algebraic]] expressions and formulae, implemented as a [[threaded code|threaded interpreter]].<ref name="RPL3"/> RPL has many similarities to [[Forth (programming language)|Forth]], both languages being [[stack-oriented programming language|stack]]-based, as well as the list-based [[LISP]]. Contrary to previous HP RPN calculators, which had a fixed [[4-level RPN|four-level stack]], the [[dynamic RPN stack|dynamic stack]] used by RPL is only limited by available [[random-access memory|RAM]], with the calculator displaying an error message when running out of memory rather than silently dropping arguments off the stack as in fixed-sized RPN stacks.<ref name="Wessman_2016"/>
RPL originated from HP's [[Corvallis, Oregon]] development facility in 1984 as a replacement for the previous practice of implementing the [[operating systems]] of calculators in [[assembly language]].<ref name="RPLMAN"/> The first calculator utilizing it internally was the HP-18C and the first calculator making it available to users was the HP-28C, both from 1986.<ref name="Wickes_1987"/><ref name="RPLMAN"/> The last pocket calculator supporting RPL, the HP 50g, was discontinued in 2015.<ref name="Kuperus_2015_1"/><ref name="Kuperus_2015_2"/><ref name="Wessman_2015"/> However,<!-- an [[Mobile app|app]] is available for [[Android (operating system)|Android]], go49gp[https://play.google.com/store/apps/details?id=o2s.emul.hp49gp&hl=en_US], which emulates the HP 49g+/50g and will run RPL programs. --> multiple emulators that can emulate HP's RPL calculators exist that run on a range of operating systems, and devices, including iOS and Android smartphones. There are also a number of community projects to recreate and extend RPL on newer calculators, like [[newRPL]]<ref name="newRPL"/> or [[DB48X]]<ref name="db48x"/>, which may add features or improve performance<ref name="newRPL-speed"/>.
==Variants==
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<ref name="Wessman_2015">{{cite web |title=Windows 10 won't allow HP 50g USB drivers to be installed |author-first=Timothy "Tim" James |author-last=Wessman |work=MoHPC - The Museum of HP Calculators |date=2015-12-26 |url=http://www.hpmuseum.org/forum/thread-5386-post-48114.html#pid48114 |access-date=2016-01-01}}</ref>
<ref name="Wessman_2016">{{cite web |title=What to do with stack overflow OBJ->/LIST->? |author-first=Timothy "Tim" James |author-last=Wessman |date=2016-06-21 |orig-date=2016-06-20 |work=MoHPC - The Museum of HP Calculators |url=https://www.hpmuseum.org/forum/printthread.php?tid=6436 |access-date=2023-09-24 |url-status=live |archive-url=https://web.archive.org/web/20230924101041/https://www.hpmuseum.org/forum/printthread.php?tid=6436 |archive-date=2023-09-24}}</ref>
<ref name="db48x">{{cite web |title=DB48X on DM42 |author-first=Christophe |author-last=de Dinechin |work=DB48X |year=2022 |url=https://github.com/c3d/DB48X-on-DM42 |access-date=2023-10-23}}</ref>
<ref name="newRPL">{{cite web |title=newRPL documentation |author-first=Claudio |author-last=Lapilli |work=newRPL |date=2014 |url=https://newrpl.wiki.hpgcc3.org/doku.php |access-date=2023-10-23}}</ref>
<ref name="newRPL-speed">{{cite web |title=newRPL N-queens benchmark |author-first=Claudio |author-last=Lapilli |work=MoHPC |date=2014 |url=https://www.hpmuseum.org/forum/thread-2368-post-20947.html?highlight=newRPL#pid20947 |access-date=2023-10-23}}</ref>
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