Picture a car from 1975. Got it?
How different is it from a car produced this year? Pretty different. A modern car has a pretty different cluster of interfaces and features on its dashboard, from satellite-equipped stereos to GPS devices.
But how different, really? Would you have any trouble driving a car from 1975? The steering wheel, pedals, and shifters have not changed a whole lot.
This is how you used a computer in 1975. Switches. LEDs. Counting only in base-8. Stop-bits.
The comparison isn’t fair. We’d have to compare cars from the very early 20th century to cars of the early-mid century. I think it would still be a pretty incredible difference. Computer technology moves fast.