The Quadra series of Macintoshes was created in 1991 as Apple's high end-professional grade machines, based on the Motorola 68040 processor. It replaced the Macintosh II series and was succeeded by the PowerPC based Power Macintosh series in 1994. The first machines that kicked off the line were the 700 and 900, both released in 1991. Apple discontinued the line in 1994, after the release of the Quadra 630.