Altair Basic Interpreter Source Code (1975) [pdf]

Here is the 6502 assembly source code for Microsoft Basic:

https://github.com/microsoft/BASIC-M6502

"FILE WILL BE DELETED AFTER PRINTING"

hah I've never seen that before but reminds me to roguelike games.

"permadeath coding" would be actually fun. IF compiler error THEN erase code repository or something like this

These two guys* were crazy productive in the 2 months they worked. Just the level of commenting shows how much thought they were able to give it during that span.

* plus the math package guy