Everything You Never Wanted to Know about Computers

“Hello, world” from scratch on a 6502 — Part 1
Ben Eater

This is where I spent my 20 years working on computers. Now that I think about it, a couple of computers I worked on, the PDP-8 and the TI 990 Minicomputer, both had pushbuttons on the front panels that allowed you to enter data directly into memory using your fat little fingers, otherwise known as fat-fingering. You only did that a couple of times before you got your ducks in a row and started using terminals to write code.

This guy has a long way to go to write his "Hello, world!" program.