An OPS5 expert system converted to FORPS

FORPS, a simple Forth-based production system, has been used to reimplement TRAPS, an expert system originally programmed in OPS5 to perform input data checking in Goddard's Communications Link Analysis and Simulation System (CLASS). The FORPS version of TRAPS is implemented both on the CLASS computer and on an IBM PC/AT compatible machine (Hewlett-Packard Vectra). This paper presents results of the TRAPS reimplementation; compares FORPS with OPS5, including efficiency on the HP Vectra; and offers suggestions for enhancements to FORPS.