TI-99/4A internal architecture
TI 99 Joystick Port Pins
Testing a Texas Instruments TI-99/4A Without Power or Video Cables – Justin Paulin
Texas Instruments Ti-99/4A Joystick Adapter Converter with 1.5m Extension | eBay
Joystick Extension Cables -TI 99/4a – The Brewing Academy
TI-99/4A FAQ: Joysticks and controllers - arcadeshopper.com
6 Button Gamepad for the TI-99/4a - TI-99/4A Development - AtariAge Forums
TI 99 Joystick Adapter
TI-99/4A - Wikipedia
Atari joystick port - Wikipedia
TI99 TI 99 TI-99/4A Hardware Texas Instruments
Joystick Pinouts
Texas Instruments Ti-99/4A Twin Joystick Adapter (2 port)
Home Computing with Texas Instruments
Texas Instruments TI-99/4A joystick adapter - EasyEDA open source hardware lab
TI-99/4A FAQ: Joysticks and controllers - arcadeshopper.com
9pin Joystick Controller Cable for Atari 2600 Commodore C64 Vic-20 Ami – RetroArcadeCrafts
TI-99/4A standard joystick
TI-99/4A Atari Joystick Adapter - Share Project - PCBWay
Texas Instruments TI-99/4A (1981) | Oldcomputr.com
Ti-99/4a | nIGHTFALL Blog / RetroComputerMania.com
Readers' Feedback: How To Build Your Own TI-99/4A Joystick Adapter
T'Crass@Home: Computers » Vintage » TI-99/4A » Joystick Adapter
Texas Instruments Ti-99/4A Joystick Adapter Converter with 1.5m Extension | eBay
TI-99/4A KSP Controller Has A Handle On Vintage NASA Styling | Hackaday
