The technique for simulating a microprocessor is fairly straightforward: Establish a structure to reflect the processor's architecture, and establish procedures for working with the structure for the various op codes. This technique is used here to develop the simulation of a more powerful (and real) microprocessor, the Intel 8085, a general-purpose 8-bit device that has been around since the late 1970s. Despite its 'age,' the 8085 is still used. The simulation was written in Arity Prolog, mainly because it implements the widely used DEC-10 (Edinburg) syntax and, theoretically, should port to other Prologs with minimum fuss. Conversion to Borland's Turbo Prolog, however, may require more work than for others. The ARI filename extension is used by Arity/Prolog. The total amount of code is approximately 45K bytes.
