Sinclair President

The calculator was launched in early 1978, at the price of £17.95. It was the only Sinclair calculator not made in England but instead made in Hong Kong by Radofin. Competition in the calculator market was by this point fierce, and the Sinclair did not fare well against cheaper Japanese calculators with more efficient liquid-crystal displays. The silver paint used was of poor quality and was notorious for wearing off.

Both models were the same size, and intended for desktop use, being slightly too large to be readily portable at 160 by 94 by 28 millimetres (6.3 in × 3.7 in × 1.1 in). Power was supplied by two AA batteries. The screens were eight-digit vacuum fluorescent displays, which resulted in a higher power consumption than a calculator with a liquid-crystal display.

The President, as well as addition, subtraction, multiplication and division, had percentage, memory, square root and square functions. It was powered by a National Semiconductor MM57134ENW/M integrated circuit. The President Scientific added logarithmic and trigonometric functions and was powered by a General Instrument CF-599.

The Sporting Life SETTLER was a calculator designed for betting shops, with development sponsored by Sporting Life. Due to the increased pressure on the calculator market, a number of calculators were produced for a specific purpose, where there was less competition. The Settler had National Semiconductor DS8881N and MM5799NBX/N chips, and was slightly larger than the President, at 163 by 93 by 29 millimetres (6.4 in × 3.7 in × 1.1 in). It was also produced in Hong Kong by Radofin.