Archived tweet #9755 from the @leastfixedpoint Twitter Archive@jjcarett2 The best real source I have is "The Early History of Smalltalk", Alan Kay, 1993, ACM SIGPLAN Notices (paper given at HOPL-II) [1]. See in particular part V, and everything about Smalltalk-76.
[1] worrydream.com/EarlyHistoryOf…