Abstract
The article presents an interactive programming system for personal computation, especially in the scientific and engineering domains. The system is modular and provides an elaborate and original user input interface quite different from the single line input editors found in many interactive systems. High-level programming is done in a new language named Fifth. Fifth is a simple language yet allowing efficient and structured programming. It uses untyped 32 bit data words and postfix notation. Block structure is provided by a notion of objects. Programs are input incrementally in a bottom up fashion but tools for top down programming are provided too. The Fifth compiler is implemented in a multi-processor system with the so-called Intemex architecture. It automatically employs several processors to execute a Fifth program. The programming system also allows assembler level programming, and it gives access to all processor classes in the system, including peripheral subprocessors.
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