Macro language design for SYSTEM/360

Of several programming languages for IBM SYSTEM/360, the Assembler Language (AL) is closest to the machine language in form and content.
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Because AL enables the programmer to use all SYSTEM/360 facilities as directly as if he were coding in machine language, AL can be used for all types of applications, and affords the programmer complete freedom in adapting special programming techniques to his specific needs. This paper discusses a macro language that programmers can invoke to reduce AL programming effort and shorten AL source programs.