ti84-forth

Forth also requires very minimal resources to implement which can be fun in constrained environments. Here it is on a TI-84+ calculator[0] or even a computer in The Powder Toy.[1] The runtime design is a little quirky but straightforward and you can extend the system as you execute (or even change interpreter semantics), or add optimizations such as some form of JIT quite easily. [0] https://github.com/siraben/ti84-forth [1] https://github.com/siraben/r216-forth

Some time ago I wrote an implementation of Forth that runs on the TI-84+ and TI-83+ calculators directly inspired by Jonesforth.[0] It runs under TI-OS as well, but the amount of available space is somewhat limited. On another implementation I wrote[1] you have full access to the calculator hardware and memory from Forth. [0] https://github.com/siraben/ti84-forth [1] https://github.com/siraben/zkeme80

On the TI-84+, assembly programs still work and it's still a test-approved device. I wrote a Forth interpreter[0] that can interop with the syscalls as well [0] https://github.com/siraben/ti84-forth

Anyone know if it would work on lower end microcontrollers like the Z80? I managed to use the TI-84+'s I/O port connected to a speaker to play simple tunes[0] using a Forth program I wrote[1], but maybe I can exploit the hardware to modulate AM frequencies? [0] https://photos.app.goo.gl/EumYVgyfMN1ncwkQ7 [1] https://github.com/siraben/ti84-forth/blob/master/programs/m...

It is possible to write a Forth implementation[0] for the Z80 that uses just enough registers to get the execution model on top. [0] https://github.com/siraben/ti84-forth/blob/bc0140d641a121a4f...

As someone who has just got out of the curriculum that enforces usage of the TI calculators, given the ubiquity of these devices, I wish it was used more in teaching students about low-level programming, hardware, etc. especially with older models such as the TI-84+ there's great hacking potential. Compared to programming on the modern software stack, the Z80 is minimal. Plus, who said it has to be in assembly? Forth would do! Some of my own hacking attempts: [1] https://github.com/siraben/zkeme80/ [2] https://github.com/siraben/ti84-forth/

With Forth there are a handful of core words you really need to get things going, some ubiquitous but not mandatory convenience ones, and then it's up to what best fits the platform. There is no such thing as "the" Forth. Isn't Lisp just the same? The TI-84+ series is such a specific technological niche that it makes sense to write a Forth customized for it platform, which the author of this OS did earlier[0]. This repo is an OS though, so "Forth-based" means the OS is built on a Forth platform but with enough extra features that it is more than just a Forth language at this point. Also, arguably, the part where it is compiled through Scheme might make the purists say it's not a true Forth (which tend to be self-hosting). [0] https://github.com/siraben/ti84-forth

https://github.com/siraben/zkeme80 As a successor to my previous project[1], a Forth interpreter that runs under the TI operating system, I decided to go all the way and write my own assembler and OS. This is a project I've been working on for just over a month, but there's still a long way to go. The idea is to have a kernel + the Forth interpreter and compiler, then users can modify how their operating system works through the Forth files. My Forth implementation is mostly ANS-standard conforming, so most code should work right out of the box without any problem. See the GitHub repository for more, along with building instructions (you only need Guile and make build!) [1] http://github.com/siraben/ti84-forth

https://github.com/siraben/ti84-forth Hi HN! For the past year I've been getting into programming in Z80 assembly (especially for the TI-84+). More recently I've been learning about the Forth programming language and after a lot of searching online (in vain) for a Forth interpreter for the TI-84, I decided to write one myself. It's been fun demoing this to others, because it's a very unexpected use of a calculator. It's my largest project to date, and I'm interested to know what the HN community thinks, please feel free to critique my code! -- Ben