I helped a friend-of-a-friend debug some control circuits on an ancient drill press. I wondered "why not throw a microcontroller and some SSRs in here instead o

I helped a friend-of-a-friend debug some control circuits on an ancient drill press. I wondered "why not throw a microcontroller and some SSRs in here instead of dealing with all this goofy relay logic?" Then I realized that I was servicing a 50 year old piece of equipment, which would continue to be serviceable long after Microchip stops making ATMega328s.