In 1975 I worked for a bank doing loans and mortgages. Made $9000 Canadian and spent $100 on a cutting edge pocket calculator. Not many features. Not solar or battery power. Had to be plugged in to work.

Don't even mention my old alarm clocks with the flip over numbers.
Or my old 24 inch big thick boat anchor of a TV before we went flat screen.

Starting to understand why some say the digital micro chips were so important in advancing technology.

I don't pretend to understand a great portion of your builds but find it very informative and interesting. I am learning though.

I started as a paramedic in 1979 and was amazed how our communications improved over the years. Just the addition of portable radios with repeaters to the trucks to talk to our dispatch was game changing.

Always amazed to find out how much I don't know but worse is realizing how much I don't know about what I don't know.

Thanks for sharing all this with us.

Jim