Tokyo stocks edged up Wednesday morning, with support coming from sharp gains on Wall Street overnight and buying in automakers and other exporters after the yen tumbled to a 24-year low against the dollar. The 225-issue Nikkei Stock Average rose 9.64 points, or 0.04 percent, from Tuesday to 26,255.95. The broader Topix index was up 3.05 points, or 0.16 percent, at 1,859.25. On the top-tier Prime Market, gainers were led by pharmaceutical, rubber product and transportation equipment issues.