The TI99/4A was 16-bit (but crippled in weird ways) 70s/80s home computer. It was my first computer, so I make sure to have an emulator for it working on all my systems.
It is the cartridge games that are easy to play in emulation: disk-based software for the TI99/4A was and still is a royal pain to work with. Luckily there were lots of cartridges, the best of which were arcade game clones by AtariSoft.
The precompiled arm binary located here runs fine on the pocket chip.
Simply put the system rom TI-994A.ctg and game roms in the same directory as the ti99sim-sdl binary and run your game:
You can easily adapt the mednafen zenity GUI script to launch this emulator if you need to have an icon and file selector.
Hint: if you don't have the system rom and games, take a look in one of the files in the scripts folder to see where to find/convert them. I have not tested this since I already own a TI99/4A and roms.