The costs of developing, and perfecting the processes to fabricate, a new generation of memory chips are so enormous that Motorola Inc, already sharing IBM Corp’s X-ray synchrotron and allied with IBM on the PowerPC, is considering joining the IBM-Siemens AG-Toshiba Corp alliance formed to do 256M-bit memory chips when it moves on to the 1G-bit part. It was IBM in Tokyo that confirmed to Reuter that talks between the four had been held.