 His first job was as a computer salesman with IBM, and he soon won success in that field.In 1961 he was appointed lead salesman for the 3000 series, a new computer system which used a novel small-sized punched card and was designed for the smaller business.By spending his weekends driving around the industrial estates of west London, and on Monday mornings presenting a list of company names to his secretary, he rapidly built up a strong following of prospective customers.