CP-67 was the ''control program'' portion of

CP/CMS CP/CMS (Control Program/Cambridge Monitor System) is a discontinued time-sharing operating system of the late 1960s and early 1970s, known for its excellent performance and advanced features. It had three distinct versions: * CP-40/CMS, an ...

, a

virtual machine In computing, a virtual machine (VM) is the virtualization/ emulation of a computer system. Virtual machines are based on computer architectures and provide functionality of a physical computer. Their implementations may involve specialized h ...

operating system developed for the

IBM System/360-67 The IBM System/360 Model 67 (S/360-67) was an important IBM mainframe model in the late 1960s. * It had "its own powerful operating system... heTime Sharing System monitor (TSS)" offering "virtually instantaneous access to and response from t ...

by IBM's

Cambridge Scientific Center The IBM Cambridge Scientific Center was a company research laboratory established in February 1964 in Cambridge, Massachusetts. Situated at 545 Technology Square (''Tech Square''), in the same building as MIT's Project MAC, it was later renamed ...

. It was a reimplementation of their earlier research system

CP-40 CP-40 was a research precursor to CP-67, which in turn was part of IBM's then-revolutionary CP 67CMS – a virtual machine/virtual memory time-sharing operating system for the IBM System/360 Model 67, and the parent of IBM's VM family. CP-40 ran ...

, which ran on a one-off customized S/360-40. CP-67 was later reimplemented (again) as CP-370, which IBM released as

VM/370 VM (often: VM/CMS) is a family of IBM virtual machine operating systems used on IBM mainframes System/370, System/390, zSeries, System z and compatible systems, including the Hercules emulator for personal computers. The following ver ...

in 1972, when

virtual memory In computing, virtual memory, or virtual storage is a memory management technique that provides an "idealized abstraction of the storage resources that are actually available on a given machine" which "creates the illusion to users of a very ...

was added to the

System/370 The IBM System/370 (S/370) is a model range of IBM mainframe computers announced on June 30, 1970, as the successors to the System/360 family. The series mostly maintains backward compatibility with the S/360, allowing an easy migration path ...

series. Details on the development and circumstances of CP-67 can be found in the article History of CP/CMS.

Family tree

{{DEFAULTSORT:Cp-67 Virtualization software IBM mainframe operating systems History of software VM (operating system)