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This was my bible for many years. We called it POOP (Principles Of OPeration. I loved assembler on the 360 and the 370. I learned Assembly Language by cross listing my COBOL programs and using POOP to find out what the op codes meant.

System 370 assembler was the first language I worked in professionally. We called it the POPS manual. As I recall it was a paragon of technical writing. I learned how to read technical documentation on this manual.

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