- 99er.net
Texas Instruments TI-99/4A resource site with software downloads, documentation, and community projects.
- Arcade Shopper
TI-99/4A parts, peripherals, ICs, repair components
- Planet 99
TI-99/4A software archive and emulation resources for Texas Instruments vintage computer enthusiasts.
- Rabbithole Computing
TI-99/4A parts, manuals, software preservation
- TexElec
TI-99/4A, C64, VIC-20 modern peripherals and carts
- The Brewing Academy
Commodore, Amiga, TI parts and modern upgrades
- TI-99/4A Tech Pages
Extensive technical documentation for the TI-99/4A computer including hardware architecture, programming, and peripherals.