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Outlines the more important design concepts behind BIOMOD, RAND's interactive graphic simulation system. During a construction phase based on GRAIL, the user describes his model via diagrams; algebraic, differential, or chemical equations; and/or FORTRAN statements. BIOMOD automatically checks each statement, as completed, for syntactic validity. The data are filed in ring structures for rapid access and association. The BIOMOD compiler transforms the rings into a complete program in IBM's Continuous Systems Modeling Program (CSMP) language. Standard CSMP translation routines then complete its translation into machine code. The simulation phase consists of the standard CSMP routines plus special routines that solve chemical equations, display results, and allow user interactions. Except for compilation, BIOMOD is entirely "interrupt-driven," using no processor time until the user inputs data or directives. (See also R-617, R-746, RM-5999.)

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