Modern digital control for a small iterative analog computer: The APE II digital module

The APE II computer system is a small solid-state iterative differential analyser designed for laboratory instruction and is capable of both repetitive and real-time operation. This paper describes the APE II digital module, which includes a master clock for generating reset and sampling pulses, random and pseudo-random noise generators, digital counters and free patchable digital logic. This module, when used with the APE II analog module or similar small analog computers, permits a very wide variety of hybrid simulation and statistical experiments.