A Japanese court has ruled that evidence collected as part of a year-long investigation into Intel business practices should be disclosed.

Intel rival AMD will now use the evidence as part of its case against Intel in which it alleges the chip giant violated Japan's Anti-monopoly Act.

The Japan lawsuit was filed days after AMD hit Intel with an anti-trust suit in the US, and three months after the Fair Trade Commission of Japan (JFTC) found Intel had abused its monopoly power in the Japanese microprocessor market, substantially restraining competition.

Intel disagreed with the findings but didn't officially challenge them and pledged to refrain from several types of business practices.

AMD is seeking $50 million damages in the Tokyo High Court and millions more in Tokyo District Court for "various anti-competitive acts" by Intel.

AMD was, naturally, delighted with the court decision to release the JFTC's work. "This is significant because the JFTC issued a recommendation based on the documents that they obtained from dawn raids [on five PC makers] and now we can use that evidence in the court case," said a spokesman. "This is very significant evidence that we've been trying to get."

It is said that Intel paid the five PC makers to either buy only Intel PC processors or limit purchases of PC processors from AMD. Intel's payments to Toshiba, in the form of "market development funds" were estimated to be between $25 million and $30 million per quarter.