Abstract: A pipelined interpretive-type digital data processing system supporting one or more input high level languages is comprised of a multi-level hierarchy of processors designatable in descending order as S, M, N and P processors and operable so that the processor at each level interprets instructions at the level above in a pipelined manner. Each of the S, M and N processors is provided with its own memory for respectively storing S, M and N instructions which are selected and fetched during system operation so as to provide a hierarchical interpretation of each input high level language. This is accomplished in a manner such that fetched M instructions are first processed by the N-processor in accordance with corresponding fetched N instructions before being employed by the M-processor for processing data.

Abstract: An interpretive-type digital data processing system, providing program protection and supporting one or more input high level languages. The system is comprised of a multi-level hierarchy of processors designatable in descending order as S, M, N and P processors is operable so that the processor at each level interprets instructions at the level above in a pipelined manner. Each of the S, M and N processors is provided with its own memory for respectively storing S, M and N instructions which are selected and fetched during system operation so as to provide a hierarchical interpretation of each input high level language. This is accomplished in a manner such that fetched M instructions are first processed by the N-processor in accordance with corresponding fetched N instructions before being employed by the M-processor for processing data.