System 7.1P3 was released in October 1993 for the Macintosh Performa 410, 460, 475 and 550 which initiated a temporary "Performa system software" era. Despite the differences (and the apparent 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 maximized by making the default setting 256 colours instead of black-and-white.