since unknown year (earliest usage recorded on this site was 1978)
VAX Macro is the computer assembly language implementing the instruction set for the line of CPUs designed to run the OpenVMS operating system created by Digital Equipment Corporation in 1977. OpenVMS now belongs to Hewlett-Packard.
The syntax, directives, macro language, and lexical substitution operators of VAX Macro previously appeared in Macro-11, the assembler for the PDP-11 series of computers. VAX Macro or, as it was also known, Macro-32, supported the VAX processors developed and manufactured by Digital Equipment Corporation. It ran under the VAX/VMS operating system and produced object files suitable for the VAX/VMS linker. The Macro-32 assembler (and the linker) were bundled with the operating system.
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