History of Mainframe computer

More than a few manufacturers formed mainframe computers from the late 1950s through the 1970s. In those "glory days" it was "IBM and the Seven Dwarfs": Burroughs, Control Data Corporation, General Electric, Honeywell, NCR, RCA, and UNIVAC. IBM's dominance grew out of their development of the 360 series mainframes; this basic architecture has sustained to develop into their current zSeries/z9 mainframes which are debatably the only mainframe architecture still extant that dates from this early period. That said; while they can still run 24-bit System/360 code, the 64-bit series and System z9 CMOS servers have almost nothing physically in common with the older systems. The larger of the latter IBM competitors were also often referred to as "The BUNCH" from their initials.