IBM DOS/360 (IBM’s Disk Operating System/360 )

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Evolution of DOS/360 and IBM Mainframe Operating Systems
Outlines the history and technical evolution of IBM’s Disk Operating System/360 and its subsequent versions. Originally developed as a temporary solution while the more complex OS/360 faced delays, this operating system became a staple for smaller mainframe systems due to its low memory requirements. Details how the software transitioned from basic functionality to more advanced iterations like DOS/VS, which introduced virtual memory, and eventually z/VSE for modern hardware. It explores core technical aspects, such as the use of transient areas to conserve storage and the gradual introduction of multiprogramming capabilities. Additionally, the article contrasts the system's cryptic job control language and utility programs with other IBM software of the era. Ultimately, the text serves as a comprehensive record of a software lineage that supported enterprise computing for over half a century.

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