THIS high-tech bike is home for traveling writer Steve Roberts. It has five computers, a satellite transceiver, two ham radios, a cellular phone, security system, refrigerator, fax unit, microfiche library and TV set. Steve runs his gadgets with solar power and uses the bike’s 36 gears to haul a 4-ft. trailer. He and galpal Maggie Victor, who has her own bike, rode 6,000 miles on their first date.