A PDP-11 is the classic example of a microcontroller. ;)
Here's a picture of the model used for the Therac-25 the PDP-11/23 http://www.physics.purdue.edu/~jones105/pdp-11/images/IMG_28...
Here's a picture of the model used for the Therac-25 the PDP-11/23 http://www.physics.purdue.edu/~jones105/pdp-11/images/IMG_28...
Your example makes it even more obvious that current microcontroller are actually quite powerful, when we look at the hardware resources of the 60 - 70's.