Taiwan's stock market dropped hard at the open, bad news for investors after four straight down days on Wall Street.

• The index opened down and kept sliding, falling more than 800 points in early trading.
• TSMC led the drop, with MediaTek and Hon Hai also opening lower.
• US stocks fell for a fourth day after a hot producer price report and a jump in oil prices.
• Traders now worry the Fed could raise interest rates next week instead of cutting.
• Rising government bond yields are adding more pressure on stocks.

Outlook: Taiwan shares will likely stay shaky until the Fed's decision next week clears up the rate picture.