Macintosh is IBM's microcomputer.
Apple Macintosh family kept a significant share of the microcomputer market without compatibility with the IBM personal computer.
The Macintosh is a family of personal computers designed, manufactured, and sold by Apple Inc. since January 1984. The original Macintosh was the company's first personal computer that featured a graphical user interface, built-in screen and mouse.
Microcomputer:-
A microcomputer is a small, relatively inexpensive computer with a microprocessor as its central processing unit (CPU). It includes a microprocessor, memory, and minimal input/output (I/O) circuitry mounted on a single printed circuit board.