VisiCalc made spreadsheets key to initial personal computer success (Apple IIe). Later, desktop publishing with the Mac. Then, hypertext and the www with the NeXT. Finally, mobile computing with the iPhone and iPadSteve Jobs was very clear in how crucial it was to the early success of Apple. "If Visicalc had been written for some other computer," he told his interviewer in 1990, "you'd be interviewing somebody else right now."