page_title: PDP-11 architecture
section_title: MACRO-11 assembly language
hierarchical_section_title: PDP-11 architecture / MACRO-11 assembly language
context_page_description: The PDP-11 architecture is an instruction set architecture developed by Digital Equipment Corporation. It is implemented by central processing units and microprocessors used in PDP-11 minicomputers. It was in wide use during the 1970s, but was eventually overshadowed by the more powerful VAX-11 architecture in the 1980s.
context_section_description: MACRO-11 is the assembly language for the PDP-11. It is the successor to PAL-11 (Program Assembler Loader), an earlier version of the PDP-11 assembly language without macro facilities. MACRO-11 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.
caption: Punched tape used for PDP-11
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