The computer maker said it will close its semiconductor operations in Minnesota and move the work to California at a cost of 900 jobs. A Minnesota semiconductor plant in Eagan and a packaging operation in Roseville, which were part of the old Sperry operation, will be closed by December. The work from both places will be moved to Rancho Bernardo, Calif., which was part of the old Burroughs. About 100 Minnesota workers will be offered jobs at the Rancho Bernardo plant, Unisys said. Others will be given counseling and help in finding work, and some will be offered positions elsewhere in the company, Unisys said.