I searched a bit, and found a large set of pages with information on the topic in the context of the 360 architecture. I'd say this architecture is unique in th

I searched a bit, and found a large set of pages with information on the topic in the context of the 360 architecture. I'd say this architecture is unique in that it is still to this day used to write high level software. Put "360 assembler macros" in your search engine and you'll find lots of information. This is a good place to start: https://www.ibm.com/docs/en/zos/2.1.0?topic=language-macro-instructions https://www.ibm.com/docs/en/zos/2.1.0?topic=language-macro-i...