No more energy-hogging computers and printers. No more keeping up with the technology race. Manual typewriters — those click-clacking standards of old-time newsrooms and secretary pools — are back in vogue, and enthusiasts are popping up all over. Many aficionados are into collecting old models (and the ribbons, corrective fluid and other vintage paraphernalia that go with them), while others enjoy gathering for type-ins at bookstores and bars. Riding the nostalgia wave is a revival of typewriter repair shops.