The Macintosh II models were "modular" systems which did not include built-in monitors and were intended for business use. Beginning with the Apple Macintosh II and culminating in the Macintosh IIfx, the Mac II series was Apple Computer's high-end line from 1987 until the introduction of the Motorola 68040-based Macintosh Quadra computers in 1991.
The Mac II series models used the Motorola 68030 microprocessor (except for the original Mac II which used the 68020.)
To augment the computing power of these machines, dedicated math co-processors and DSP chips optimized or sound and video were often incorporated into their architecture.