ti84-forth VS Ndless

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

I updated my calculator before I learned about Ndless and, from what I've read, there's no way to do a rollback. What are my options? Is there some program that can rewrite the OS or something? Is there a workaround?

The CEs are a good for numerical calculations and have a pretty active developer base which makes them great models to learn to program with, if you intend to use or want good programming functionality, these are the best models for it imho. The Nspires, especially models with CAS and that support Ndless, are good too (I've barely used mine ngl so idk what to put here).

That said, the hardware in modern calculators, especially CAS related ones, is quite powerful. Various hobbyists have actually developed tools to deploy relatively heavy Linux distros onto TI Nspire calculators. Practically speaking, they're pretty unwieldy and slow, but it is possible.

ndless

if you're talking about the TI-Nspire series, then yes through the toolchain/SDK of Ndless, the unofficial/fought-by-TI "jailbreak" (see here). It's a typical arm toolchain, so C/C++/ASM is supported (and more with enough work), and lots of things have been created and ported along the years.

As another person already said, there no builtin way to do that since you have the non-CAS version. However you can use third party CAS engines, like KhiCAS, if you're able to install Ndless (if you don't have a recent OS version it should be doable - check https://ndless.me)

I’m planning on installing Ndless (http://ndless.me) onto my CAS to play Minecraft (yes, I know… it’s dumb) and do fun little projects like programming a game on the CAS.

Emulator most likely require ndless to be installed (nspire jailbreak), sadly it’s version dependent, which is why I don’t advice anyone to upgrade to the newest os. Which that said you could explore the ndless apps (which has seemingly just shut down) which offer a mini Pokémon for example - this is not (at least to my knowledge) the „OG game“, but people definitely tried there best to make it good

I can recommend ndless to you, since it opens quite a lot of possibilities, like cas calculations via KHICAS, emulation support and neat other stuff that could be potentially useful (like a fake light), remember to NOT upgrade to the newest os, but to one on the list shown on the ndless website, which can also be found here.

-> get ndless from ndless.me -> go to ndless-apps.org -> look for PokeMini and install