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  5. Mainframe  192 Sites
Mainframe computers are large systems that usually completely fill one or more rooms. Older makers: Burroughs, Honeywell, IBM, Sperry, Univac. Current makers: Unisys; of IBM compatible mainframes: Fujitsu Ltd., its US subsidiary Amdahl, Hitachi Ltd., IBM. IBM now dominates this market. Most other makers have been merged out of existence. Sperry and Univac merged into Sperry-Univac in 1955. Burroughs and Sperry merged into Unisys in 1986.
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IBM
Freeware, Software, z-OS, z-VM, z-VSE 178 Sites
Multics
No sub-categories 13 Sites
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Michigan Terminal System Archive - Information about the Michigan Terminal System (MTS), the computer time-sharing operating system, and the organizations and people that developed and ran it. Includes documents, images, recollections, and comments.
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Midrange
Computers : Software : Operating Systems 141 Sites
Servers
Computers : Hardware : Systems 15 Sites
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