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|Typing discipline||Static, strong|
|Platform||Norsk Data minicomputers|
The language was also used to implement Sintran III: the core and file system 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
FUNC FUN1, FUN2 FUN1: T := 1 FUN2: code here END
FUN1 could be called to set
1 before falling into
T could be set to something else and call
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.