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Concept
Nord Programming Language
Résumé
Nord Programming Language (NPL), is a procedural programming language by the Norwegian minicomputer manufacturer Norsk Data. It shipped as a standard component of the operating system Sintran III.
The language was also used to implement Sintran III: the core and of which are written in NPL, as was the NPL compiler, and some core applications early on, until the release of high-level programming language named PLANC. Then, the linker and other software were rewritten in PLANC.
The NPL compiler was also special in that it did not emit object code as most compilers do. Instead it emitted an intermediate representation, in the form of assembly language code, which then had to be assembled using the Norsk Data Assembler.
The registers of the CPU were available in NPL as predefined variables. Thus could be written:
X + T =: A
and the compiler would emit:
COPY SX DA
RADD ST DA
Functions could be declared with multiple entry points:
FUNC FUN1, FUN2
FUN1: T := 1
FUN2:
code here
END
FUN1 could be called to set T to 1 before falling into FUN2 or T could be set to something else and call FUN2. If T register specified which file handle to write to, then either FUN1 could be called to always output to terminal or T could be specified to handle a file in T and call FUN2 to output to that file.
Source officielle
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