noti-ez80 + BOS
Coming to an emulated CE near you!

I have recently coupled noti-ez80 and BOS into an open-source, free and distributable ROM image for use with CEmu!
BOS github repo
Read the provided readme for instructions on how to compile.
Additionally, BOS can run programs from a FAT32 formatted USB flash drive! This method is how BOS updates. Currently the updater only updates the OS sectors and not system files. I also plan to make a software for transferring programs and etc to/from BOS.
In order to utilize BOS's USB functionality however, (which to my knowledge only works on Linux) you will need to build the usb-host branch of CEmu, or use the OS on hardware with an OTG adapter Such as this one:


BOS can be installed to physical hardware, But be warned! Installing BOS will wipe both your calculator's RAM and Archive, and may cause instability.
If your calculator crashes and appears to no longer work, hold [on]+[2nd]+[del] while pressing the reset button found on the back of the calculator. This will hopefuly put the calc into OS recieval mode. From there, send back the TIOS using TI-Connect CE or TiLP.

If BOS functions and boots into the welcome screen, pressing [y=] followed by [del] followed by [enter] will uninstall BOS and automatically go into OS recieval mode.

If you understand the risk and still wish to proceed, simply transfer and run BOSOS.8xp to install.
Quote:
you will need to build the usb-host branch of CEmu

Wait, how do you do that?

Edit: My Windows Defender blocked me from running the batch file in the ZIP, but according to VirusTotal, nothing picked up any malicious code.
Currently preparing for a pre-release of BOS, likely to be released in the next few hours.
This pre-release will contain a ROM for use with CEmu and an installer for use with hardware.

EDIT: BOS Pre-release v1.03.0000 is now up on GitHub!
Installation and uninstallation of BOS on physical (pre rev. M) hardware functions reliably. However despite this, installing BOS on hardware is still at your own risk.
New BOS pre-release today! https://github.com/beckadamtheinventor/BOS/releases/tag/v1.03.0030

New in this release
Fixed rm, cd .., cat, ls, and others
Improved /bin/cmd.exe and /boot/boot.exe, remove /bin/clean.exe.
Restructured the default filesystem sources
Vastly improved build times with new build script, which is also more platform-independent.

In order to update BOS on-calc you will either need to reinstall TIOS first, or use a FAT32 formatted USB drive.

To update BOS on-calc, follow these steps:
send BOSUPDTR.bin to the root directory of the USB drive, plug it into the calculator, then run "updater".
With this update, you will also need to reset the filesystem. Press F1 followed by mode followed by enter. BOS will then reformat the filesystem.
  
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