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The operating system disk contained a source language library, a macro library and a core image library. The macro library included all the options for the supervisor, which was assembled by the 360 assembly language compiler, the only language available at the time, although [[RPG programming language|RPG]] came a little later. The other crucial component was the Job Controller, which was fed by punched cards using [[Job Control Language|JCL]] (Job Control Language). Most BOS users upgraded to DOS and added more core, typically to 32K or even a gargantuan (for the time) 64K. DOS was the first System/360 operating system to introduce multi-programming. It could be configured with 2 foreground partitions, typically used for spooling while the main [[JOB Stream]] ran in the background.
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[[Category:IBM Mainframe computer operating systems]]
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