Chad Boughton found a Brother WP-2200 word processor with a glorious yellow “widescreen” CRT, decent keyboard, and rather limited functionality. He was able to retrofit this piece of vintage technology to run his own code.

In addition to lobotomizing it and giving it a new modern processor brain, Chad used a Teensy-LC to preserve that gem of a keyboard. With plenty of GPIO pins available to connect to the original cable, the Teensy scans the keyboard matrix then sends those characters to the processor via UART, which in turn displays them on the screen. See it in action in the video below!

Chad also has an Instructables tutorial on Make Any Vintage Keyboard Work With a Modern PC using a Teensy.