Great day to answer this. If you exclude edln or WordStar then it was the Cornell Program Synthesizer which also happened to be among the very first IDEs (Smalltalk came first as did LISP editors). @davepl1968 resurrecting this machine as we speak. https://x.com/stevesi/status/21036075848…

SebAaltonen@SebAaltonen6h ago

I started with Turbo Pascal 7.0. Such a nice IDE. No bloat. Started instantly. All of these new ones have so many issues. https://t.co/BWIRiPg5Wq https://t.co/sEFXB47eIX