Calculator watch financial functions (in the Casio CBA-10). Usually calculator watch operates with eight digits number, however, calculator watch can operate with 6 digits (for example, Casio C-801) or 10 digits (Casio CBA-10) numbers. Calculator watches first appeared in the mid 1970s introduced by Pulsar (1975, then a brand of the Hamilton Watch Company) and Hewlett Packard. Several watch manufacturers have made calculator watches over the years, such as Pulsar and Timex, but the Japanese electronics company Casio produced the largest variety of models. In the mid-1980s, Casio created the Databank calculator watch, which not only performed calculator functions, but also stored
APF Electronics Inc. math learning tool and standard calculator, but it has 6 different overlays that convert it into one of several games. APF Imagination Machine II was a computer-video game console hybrid that was in the final development stages around 1983. It was more powerful and was an all in one unit. The project was canceled. It is unknown if any prototypes exist. The North American video game crash of 1983 caused the project to be canceled and APF, then a publicly traded company, filed for bankruptcy. APF Electronics Inc. APF Electronics, Inc. was a publicly traded company in the United States