A new motherboard for the 30 year old Tandy TRS-80 based on a Teensy++. The old one had died, but the LCD and keyboard were still perfectly functional. I’ve built a new interface board that can drive the ten HD44102CH bitmap display drivers with both line drawing and a 5×7 font, and scan the matrix keyboard. Currently it shows up as a “vt100-like” USB serial device, but could function much like the original Model 100 with its own file editor and programming language.
More details: www.nycresistor.com/2013/01/06/trs80-model100-upgrade/
Source code: bitbucket.org/hudson/model100/src