My first computer was a TI-99/4A. This is the computer I learned to program on. I used this as my only computer until 1989. It was used for papers, solving math, programming, drawing, and gaming.
My Projects for the 4A:
Availability: I don’t make hardware to sell anymore. My designs are open source. Generally ArcadeShopper.com is able to source from alternative builders.
TIPI - Storage and network solution
All the details are on Github, the tipi wiki is for end users.
Sideport 32k - Memory expansion for bare consoles
TI99UsbKeys - Use USB keyboard to control your TI-99/4A