01979 is still a lot later than smalltalk-72 or the original cadr design from 01974 (https://www.researchgate.net/publication/221213025_A_LISP_ma... says 'several suitable [semiconductor memory] devices are strongly rumored to be slated for fourth quarter 74 announcement' so maybe they didn't actually get it working until 01975 when they ported emacs to it)
01979 is still a lot later than smalltalk-72 or the original cadr design from 01974 (https://www.researchgate.net/publication/221213025_A_LISP_ma... says 'several suitable [semiconductor memory] devices are strongly rumored to be slated for fourth quarter 74 announcement' so maybe they didn't actually get it working until 01975 when they ported emacs to it)