IBM's Model 5150 PC was released in 1981, sadly, its keyboard did not live up to that standard. Stung by the criticism, IBM assembled a ten-person task force to craft a new keyboard, according to David Bradley, a member of that task force and of the 5150's design team. Their resulting 101-key design, 1984's Model M keyboard, became the undisputed bellwether for the computer industry, with a layout that dominates desktops to this day. As we peek under the hood of this legend, you'll soon see why many consider the Model M to be the greatest keyboard of all time.
Full Article: PC World