These Celeron processors, released initially at 1.2 GHz on 2 October 2001, were based on the Pentium III 'Tualatin' core and made with a 0.13 micrometer process for the FCPGA 2 socket 370. They were nicknamed 'Tualeron' — a portmanteau of the words Tualatin and Celeron. Some software and users refer to the chips as Celeron-S, referring to the chip's lineage with the Pentium III-S, but this is not an official designation. Intel later released 1 GHz and 1.1 GHz parts (which were given the extension A to their name to differentiate them from the Coppermine-128 of the same clock rate they replaced). A 1.3 GHz chip, launched 4 January 2002, and finally a 1.4 GHz chip, launched 15 May 2002 (the same day as the 1.7 GHz Willamett-based Celeron launch), marked the end of the Tualatin-256 line.