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+= MACRO-10 assembly languge =
+MACRO-10 is the native DEC assembly language for the PDP-10 PROCESSOR architecture, used on both TOPS-10 and TOPS-20 operating systems. As n example, a simple "Hello World" program in MACRO-10 to be run on TOPS-20 may look like this:
+  - Each program module has a title, given with the TITLE assembly directive.
+  - The SEARCH directive instructs  the assembler to search the listed modules for various external symbol nd macro definiions
+  - The MONSYM module contains the system calls and related symbols of the target operating system, such as function numbers and bit masks. it is documented in Appendix B of the mcrg.
+  - The MACSYM module ontains various useful macros to expand convenient shorthand syntax during assembly. It is documented in Appendix c of the mcrg.
+  -

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