MACRO-11 is an assembly language with macro facilities for PDP-11 minicomputers from Digital Equipment Corporation (DEC). It is the successor to PAL-11 (Program Assembler Loader), an earlier version of the PDP-11 assembly language without macro facilities. The MACRO-11 assembly language was designed for the PDP-11 minicomputer family. It was supported on all DEC PDP-11 operating systems. PDP-11 Unix systems also include an assembler (called "as"), structurally similar to MACRO-11 but with different syntax and fewer features.

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Features of MACRO-11 assembly language:

• Alphabetized, formatted symbol table listing optional cross-reference listing of symbols
• Re-locatable object modules
• Conditional assembly directives
• Program sectioning directives
• Comprehensive system macro library

A complete "Hello, world!" program in PDP-11 macro assembler, to run under RT-11:

.TITLE  HELLO WORLD
.MCALL .TTYOUT,.EXIT
HELLO:: MOV   #MSG,R1 ;STARTING ADDRESS OF STRING
1$: MOVB (R1)+,R0 ;FETCH NEXT CHARACTER
BEQ DONE ;IF ZERO, EXIT LOOP
.TTYOUT ;OTHERWISE PRINT IT
BR 1$ ;REPEAT LOOP
DONE: .EXIT
MSG: .ASCIZ /Hello, world!/
.END HELLO