The scheme machine

This paper describes the design and implementation of the Scheme Machine, a symbolic computer derived from an abstract Scheme interpreter. The derivation is performed in several transformation passes. First, the interpreter is factored into a compiler and an abstract CPU. Next, the CPU specification is refined so that it can be used with the Digital Design Derivation system. Finally, the DDD system assists in the transformation into hardware. The resulting CPU, implemented in field programmable gate arrays and PALs, is interfaced to a garbagecollecting heap to form a complete Scheme system.