Hard to believe but in August 1981 IBM introduced its PC and along came all those Charlie Chaplin advertisements.  The IEEE just published a short history of the PC extracted from my history book, IBM.  I thought it might be of some interest to my fellow colleagues in SIGCIS.  https://spectrum.ieee.org/tech-history/silicon-revolution/how-the-ibm-pc-won-then-lost-the-personal-computer-market