Just as the trends of the 1980s were difficult to predict, so, too, are the forces that will drive the industry in the 1990s. But by looking at the trends of today, people are able to predict what the industry may look like in the new decade. Hardware will become a commodity while software and service will account for a greater share of computer companies' revenue, say market watchers. And growth in sales of special systems will come to a halt in the '90s.