@hal_pomeranz Microware OS-9 on a personal Dragon 64, back in the 1980s. Then at work, various Intel boxes from Regnecentralen running SunOS around 1990. In 1996 trying out Red Hat Linux dual boot, and Linux ever since.
#Microware #OS-9 #MC6809 #Regnecentralen #SunOS #RedHatLinux #Linux

The cover plate of the Microprocessor Training Lab (MTL-1) conveniently labels functional areas of the MTL-1.
Nice breadboard area for building circuits to interact with the #MC6809. Clicky tactile switches make up the keypad for programming the MTL-1.