Calculator watch Calculator watch A calculator watch is a digital watch with a built in calculator, usually including buttons on the watch face. Calculator watches were first introduced in the 1970s and continue to be produced, despite falling from their peak popularity during the 1980s. The most notable brand is the Casio Databank series, though watches made by Timex were also popular. Most calculator watches contain only a few number of functions such as +, -, x, / and percents. However, there are several models with additional functions: scientific, including transcendent and trigonometry, in models Casio CFX-200, CFX-400, Citizen 49-9421, and also
NCR Corporation 1953, the company acquired the Computer Research Corporation (CRC), after which it created a specialized electronics division. In 1956, NCR introduced its first electronic device, the Class 29 Post-Tronic, a bank machine using magnetic stripe technology. With the General Electric Company (now known as GE ), the company manufactured its first transistor-based computer in 1957, the NCR 304. Also in the 1950s NCR introduced MICR (magnetic ink character recognition) and the NCR 3100 accounting machines. In 1962, NCR introduced the NCR-315 Electronic Data Processing System which included the CRAM storage device, the first automated mass storage alternative to magnetic tape