Macro Assembler

This reference manual provides detailed documentation for the MACRO symbolic assembler used on the DECSYSTEM-20. It covers fundamental language elements (symbols, numbers, expressions), a complete guide to all available pseudo-operations, and comprehensive instructions for using the assembler, including segmentation, universal files, and conditional assembly. Appendices provide character set tables and detailed descriptions of machine instruction mnemonics. The manual is intended for programmers familiar with assembly language.