The suggested system allows an exhaustive, very low cost evaluation of an optical, anti- aircraft fire control system (FCS) before doing tests on real targets. The reliability of the results is guaranteed by using a real FCS in the test loop. Furthermore, the test loop includes gunner, operating environment, target motion, and gun performance simulation. The testing equipment is founded on an 80386-based personal computer provided with I/O interfaces toward the external world and an image processing board to generate and move a synthesized target. All the devices (computer and add-on cards) are easily available on the market. This fact contributes to lowering the cost of the whole system. The interface between the man (the gunner) and the machine is not modified at all. A TV monitor is needed to display the aiming errors, i.e., the position of the synthesized target in the optics field of view. Therefore, aiming is done by moving the FCS in order to minimize the error shown on the monitor. The simulation program sends all the parameters it needs (i.e., laser range) to the real FCS. All the software was developed using high-level programming languages run in real-time. In particular ACSL (Advanced Continuous Simulation Language, by Mitchell and Gauthier Associates), and the FORTRAN were used to get some benefit from powerful graphics and data-logging tools. Moreover, C language routines were written to manage low-level interfaces and timing problems. The use of high-level languages allowed the reduction in the time spent developing the software.