Tokyo stocks rose Wednesday morning led by major technology firms after U.S. chip giant Nvidia Corp. became the world’s most valuable company in trading overnight, while automakers gained on favorable trade data. The 225-issue Nikkei Stock Average climbed 225.10 points, or 0.58 percent, from Tuesday to 38,707.21. The broader Topix index was up 19.43 points, or 0.72 percent, at 2,735.19. The U.S. dollar was firm in the upper 157 yen range amid expectations that the U.S. and Japanese interest rate differential is likely to remain wide, dealers said. At noon, the dollar fetched 157.81-86 yen comp…