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![bg left:50% 90%](./sls.svg)

# **YREA SLS**

Kyler Olsen

Fall 2025  
Snow College  
SE 3250  
[sls.purplecello.org](https://sls.purplecello.org)

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# RPL
*HP Reverse Polish Lisp*

- Based on LISP and Forth
- Stack-oriented language with post-fix notation
- Created by HP for their calculators

<!-- ![bg right:35% 80%](./hp_calc_1.png) -->
![bg right:35% 80%](./hp_calc_2.png)

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# Project
*YREA SLS*

- Stack-oriented language with post-fix notation
- C inspired Syntax
- Can run on an embedded system

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# Language
*The C Language*

- Systems Programming
- Used for Python and PHP interpreters

Excellent fit for my project!

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# Language
*The C Language*

- Manual memory management is difficult to get right.
- C development in a Linux environment was fun and rewarding.
- In the end I had a running program on a RP2040.

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# Port 1
*Rust*

- Systems Programming (Again)
- Included build system
- Memory safe with the barrow checker

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# Port 1
*Rust*

- Unlike previous projects in Rust, I didn't fight the barrow checker this time.
- I added exporting and importing the interpreter state in the REPL.

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# Port 2
*Python*

- My favorite programming language (maybe C is a close second now)
- This port was very easy for me to do.
- I did add a calculator app as an alternative to the REPL or file execution.

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# The End
<small>You may clap now</small>