The U.S. dollar traded in the upper 77 yen zone Monday morning in Tokyo. The dollar bought 77.96-97 yen at midday compared with 77.92-78. 02 yen in New York and 77.76-78 yen in Tokyo at 5 p.m. Friday. The euro was quoted at 1.3412-3413 dollars and 104.56-58 yen against 1.3386-3396 dollars and 104.50-60 yen in New York and 1. 3478-3480 dollars and 104.81-85 yen in Tokyo late Friday afternoon.