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Line 99: ====Operating system macros==== Most programs will require services from the [[operating system]], and the OS provides standard macros for requesting those services. These are analogous to [[Unix]] [[system call]]s. For instance, in [[MVS]] (later z/OS), STORAGE (with the OBTAIN parameter) dynamically allocates a block of memory, and GET retrieves the next logical record from a file. Unlike Unix system calls, macro's are not standardized across operating systems though. Even something as simple as writing a "sequential file" is coded differently e.g. in Z/OS than in Z/VSE. ==External links==

IBM Basic assembly language and successors: Difference between revisions