Programming
- TI BASIC and Extended BASIC manual

Code:
- TI Basic Code
- - Games [text and audio] Code
- - Utility Code
- TI Extended Basic Code
- - Games [text and audio] Code

Hardware:
How can I use 16-bit computer hardware that was from 1981? "There is a hack for that"

Creating your own game adapter is cheaper than purchasing and easy!
- Creating an game adapter for the Atari CX-30 Joystick, Sega Genesis game pad, ColecoVision Flashback Controller, and Atari Video Touch pad

Here is a cassette tape drive replacement option.
- Using a modern computer as a WAV file server for the TI-99/4A (instead of cassette drive)

- Connecting a TI-99/4A to a HDMI or RCA S-Video TV/monitor