The Casio J-1 was a nice chunky handheld calculator from about 1978. The calculator had the basic four arithmetic functions as well as square roots, percentages, negative numbers and a memory. The cancel buttons are a rather nice orange while the others are white, black and beige. A very late 1970s colour scheme and quite frankly wonderful.
The J-1 had a NEC D1877C processor and an eight digit VFD display. Our one seems to work pretty well.
