PDP 7
A minicomputer (colloquially, mini) is a class of multi-user computers that lies in the middle range of the computing spectrum, in between the largest multi-user systems (mainframe computers) and the smallest single-user systems (microcomputers or personal computers). The class at one time formed a distinct group with its own hardware and operating systems, but the contemporary term for this class of system is midrange computer, such as the higher-end SPARC, POWER and Itanium -based systems from Sun Microsystems, IBMHewlett-Packard.
The minicomputer’s industrial impact and heritage
Several pioneering computer companies first built minicomputers, such as DEC, Data General, and Hewlett-Packard (HP) (who now refers to its HP3000 minicomputers as “servers” rather than “minicomputers”). And although today’s PCs and servers are clearly microcomputers physically, architecturally their CPUs and operating systems have evolved largely by integrating features from minicomputers.
In the software context, the relatively simple OSes for early microcomputers were usually inspired by minicomputer OSes (such as CP/M's similarity to Digital's RSTS) and multiuser OSs of today are often either inspired by or directly descended from minicomputer OSs (UNIX was originally a minicomputer OS, while Windows NT — the foundation for all current versions of Microsoft Windows — borrowed design ideas liberally from VMS and UNIX). Many of the first generation of PC programmers were educated on minicomputer systems.[citation needed]
