System 7.1P was released in October 1992 for the Performa 600, which initiated a temporary "Performa system software" era. Despite the differences (and the apparant dual-track system), "normal" Macs were perfectly able to run Performa system software, and vice-versa, although Apple refused to deal with any users that installed or ran the wrong system software. For colour Performas, colour support was fully maximised by making the default setting 256 colours instead of black-and-white.