Birth of BASIC

For some reason it took me years to understand the need for a line editor. It didn't make any sense in my head. Then one day I saw the famous picture of Bill and Allen as kids in front of a teletype [1] and it finally clicked. The way it worked was like this: As you keyed in your program, letter by letter, it was printed out on the paper immediately like a typewriter. If you ran the program and there was a problem, you'd just read (or re-read) the printout, find the line with the bug, then use a line editor to fix just that line. You might mark the paper with pencil to keep track of the change. After a while if you needed to see the latest version, you'd just print the whole program out, or just the lines you needed. This realization finally clued me into what was going on when I was 10yo and programming BASIC on a TRS-80 Color Computer. It was essentially simulating a teletype (which makes sense given BASIC's inception at Dartmouth [2]), where you would type each line individually, then if there was a problem, you would edit the program individual lines at a time. I always thought it was an odd until I understood how actually using a teletype actually worked. Also explains why the command to write letters to the screen is called "PRINT". 1. [link] 2. [this video]