The European Commission Monday stepped up its public relations battle with computer chip maker Intel Corp. (INTC), setting out in detail how Intel breached antitrust rules by keeping smaller rival Advanced Micro Devices Inc. (AMD) out of the computer market.

In the non-confidential version of the commission's original Intel antitrust decision from May, Europe's highest antitrust authority lays out specific cases where the chip giant abused its dominant position to put pressure on computer manufacturers and retailers not to buy AMD's chips.

The published version provides email excerpts from companies including Dell Inc. (DELL), Hewlett-Packard Co. (HPQ), Lenovo Group Ltd. (0992.HK) and Acer Inc. (2353.TW), in which company executives discuss the harsh conditions imposed on them by Intel.

According to the commission, Dell said in an internal presentation in 2003 that should the computer manufacturer switch any of its computer chip supplies from Intel to AMD, Intel retaliation "could be severe and prolonged with impact to all [lines of business]."

Meanwhile, Intel rebates to HP were conditioned between 2002 and 2005 on HP buying "at least 95% of its business desktop system from Intel," according to a company submission to the commission.

-By Peppi Kiviniemi, Dow Jones Newswires; +3227411483; peppi.kiviniemi@dowjones.com