High Quality Content by WIKIPEDIA articles! IBM System z10 is the latest line of IBM mainframes. The z10 Enterprise Class (EC) was announced on February 26, 2008. On October 21, 2008, IBM announced the z10 Business Class (BC), a scaled down version of the z10 EC. The System z10 represents the first model family powered by the z10 quad core processing engine and the first to implement z/Architecture 2 (ARCHLVL 3).