ProMOS Technologies is joining a growing list of Asian companies trying to restructure their debts to ease the pressure imposed by falling equity and bond prices as well as difficult operating conditions. According to a statement issued Friday, the Taiwanese memory chip maker is offering to buy back all its outstanding zero-coupon convertible bonds due 2012 at a maximum price of 26.5 cents on the dollar. If all bondholders were to accept the offer it will cost the company $88.9 million, which compares with an initial principal of $350 million.Contrary to earlier CB buyback ...