Morton Meyerson, an understated Texas businessman who helped H. Ross Perot build Electronic Data Systems into a world-leading data processing company, and who later advised Mr. Perot during his 1992 presidential campaign, died on August 4 at his home in Dallas. He was 87.

Mr. Meyerson was the quiet, stubborn, moneymaking computer programmer in the backroom who helped make his boss a billionaire. Mr. Perot had started E.D.S. in 1962 with a $1,000 check. In 1984, when General Motors bought the company, it had $1 billion in revenue. When Mr. Meyerson finally left E.D.S., it was the largest computer services company in the world.