1.7 KiB
YREA SLS
Kyler Olsen
October 2025
Snow College
SE 3250 Survey of Languages Final Project
Language Code Name: YREA SLS (Stack Language Specification)
Language Webpage: sls.purplecello.org
Language Specification Repository (Private): git.purplecello.org
Language Implementation Repository: git.purplecello.org
Language Implementation Repository (Mirror on GitHub) (Private): github.com
Assignment Page (Private): snow.instructure.com
In 1986, Hewlett-Packard released their HP-18C and HP-24C calculators, which introduced their new RPL operating system and programming language. The language was based on LISP and Forth (a stack-oriented language). RPL, aka Reverse Polish Lisp, was used by HP in several of their calculators through the 1990s and 2000s, most famously on the HP-48 series of calculators. HP calculators have been a favorite among engineers because of their post-fix notation.
When in my journeyings on the internet a few years ago, I discovered Uiua, a pre-fix, stack-based, array-oriented language, which inspired me to create my own, except more largely inspired by HP's RPL. I started planning out an idea, but never made it far. This semester I was again inspired by looking at the various programming languages to again make my own, this time throwing in C to the mix. What resulted is my Stack Language Specification. Having difficulty coming up with a name for the language, I went with SLS.