PIC16C84 Based Motor Control Boards
Over the weekend I went to a local swapmeet. There was a gentleman selling his old stuff. He was selling a box for a dollar with an intention that his parts go to a home instead of trash. One of the box had a few PCBs with lots of IRF FETs, I bought the box and along came lots of old parts plus a few boards with 16C84 chips! These are 4MHz chips, I have tested one of them and that completed a cycle of chip erase and blank check fine :-) So those 16C84 chips indeed made it to the right home! :-)
The box also had some ICs from 1970s and all are from Motorola and are ceradip!