Exercising test mode

Overview, key test, screen-button test

 

3 different test modes: DISP (display - which I hadn't figured out in this video), KEY (keyboard), and LFK (screen-function keys). Interesting that the time defaults to 5/5/1994.

 

Full description and reverse-engineering analysis here: www.eevblog.com/forum/projects/looking-inside-an-old-airc...

Done