arduino teensy sketch to translate usb keyboard to TI-99/4a 15 pin interface.
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TI99USBKeys
gerber
.gitignore
LICENSE
README.md
TIUSBKeys.rrb
TIUSBKeys.sch
keymap.xlsx
schematic.pdf

README.md

TI-99-usb-keys

Teensy 3.1 sketch to translate usb keyboard to TI-99/4a 15 pin interface.

This project interfaces a Teensy 3.1 and a Circuits@Home USB Host shield, to take input from a USB keyboard, and simulate the matrix keyboard built into the TI.

The USB keyboard can be used with the TI keyboard still in place. The user can switch between them at will.

Project Website

Design files

TIUSBKeys.rrb - PCBoard layout from Robot Room Copper Connection Studio Edition v3.0

gerber - folder containing necessary gerber images and drill files for printing pcboard

TIUSBKeys.sch - PCBExpress schematic source file

schematic.pdf - schematic exported to PDF

TI99USBKeys - folder containing arduino project files for Teensy 3.x