Calculator This led the way to the first credit-card-sized calculators, such as the Casio "Mini Card LC-78" of 1978, which could run for months of normal use on button cells. There were also improvements to the electronics inside the calculators. All of the logic functions of a calculator had been squeezed into the first "calculator on a chip" integrated circuits (ICs) in 1971, but this was leading edge technology of the time and yields were low and costs were high. Many calculators continued to use two or more ICs, especially the scientific and the programmable ones, into the late 1970s. The
Sumlock ANITA calculator other products, such as taximeters. In 1976 Rockwell decided to exit the calculator market, by which time cheap calculators had markedly reduced the profitability of the industry. Sumlock Anita Electronics was closed down and the ANITA name was sold to a marketing company and soon disappeared. The rest of the Bell Punch Company, which was completely independent of Rockwell, continued in business to about 1986 when it was closed down. Sumlock-Anita Electronics also assembled in Britain some of the Rockwell hand-held calculators, including Rockwell models "8R", "10R", "18R", "20R", "21R", "30R", "31R". The "Panaplex" is a gas-discharge display, using 7