Ross Perot, the wiry Texas gadfly who made a fortune in computer services, amazed the nation with audacious paramilitary missions to Vietnam and Iran, and ran for president in 1992 and 1996 with populist talk of restoring Norman Rockwell’s America, died on Tuesday at his home in Dallas. He was 89.

The cause was leukemia, a family spokesman, James Fuller, said.

They called him the man from Texarkana, but he really came out of an era — the Great Depression, World War II and the exuberant postwar years — when boys had paper routes, folks tuned in to the radio and patriots rolled up their sleeves for Uncle Sam and built innovative companies and a powerful nation.

“Most people give up just when they’re about to achieve success,” Mr. Perot liked to say. “They quit on the one-yard line. They give up at the last minute of the game one foot from a winning touchdown.”