20: Windows Vista4 years ago

48:16

21: The International Business Machines Corporation3 years ago

45:06

22: Building the Personal Computer3 years ago

28:19

23: IBM's Search for an Operating System3 years ago

26:06

24: Later IBM PC Models3 years ago

45:43

25: On PC Clones & The End of the Road for IBM’s Personal Computer Business3 years ago

38:49