Those amber and green displays were 80 chars x 24 lines - which is quite a bit less than a modern 5K monitor. They also connected to their host at 1200 baud, o

Those amber and green displays were 80 chars x 24 lines - which is quite a bit less than a modern 5K monitor. They also connected to their host at 1200 baud, or if you were really lucky twice that. (You could go faster if you had an entire mainframe to yourself, but most people didn't.) So while you could edit instantly on the display itself, doing any actual computing required a lot of waiting for the text... to... appear... from... left... to... right... I learned to write software in a room full of VT100s connected to an underpowered DEC KS10, and I have zero nostalgia for the terminal technology of the day.