A lot of computer-related tech (and defense sector) in the Boston area has historically been out in the suburbs, e.g. the "Route 128" companies. After Teradyne moved out, there was very little tech presence left in the actual city. That shifted with biotech/pharma and, more recently, with companies in the Seaport and Cambridge and the outposts of the big West Coast-HQd companies. But a lot of the tech industry is still well to the West and North of the city.