BV3D TI 99/4A Keyboard to USB Keyboard
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Give a 40-year-old Texas Instruments TI-99/4A keyboard a new life as a modern USB keyboard!
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Give a 40-year-old Texas Instruments TI-99/4A keyboard a new life as a modern USB keyboard!
This project uses an original TI-99/4A keyboard module, a Raspberry Pi Pico, and a 3D printed enclosure to create a fully functional USB keyboard. The Pico scans the original keyboard matrix and translates key presses into standard USB keyboard input, including support for the TI's unusual FCTN key combinations.
The enclosure features a comfortable 7° typing angle, a removable bottom plate, a USB cable strain relief, and an internal mounting sled for the Pico.
No custom circuit boards or soldering are required. The keyboard connects to the Pico using Dupont jumper wires. The downloadable files include the STL models, Arduino firmware, wiring diagram, and detailed assembly and programming instructions.
Tested on macOS, with standard USB HID compatibility for Windows and Linux.
NOTES
Please refer to the TI USB Keyboard Guide pdf for the How To stuff.
The included kb.ino file is the firmware source code for the Pico. Use with Arduino IDE.
IMPORTANT: LARGE-FORMAT PRINTER REQUIRED
The main enclosure is approximately 270 mm wide. Make sure your printer's usable build area accommodates the enclosure before downloading or slicing.