The APF Mark 42 is an LED calculator from the late 1970s. With its compact size and bright red display, it exemplified the LED calculator era before LCD displays took over in the 1980s. The Mark 42 measures just 67 x 126.5 x 27.1 mm and weighs only 70g without …
In the mid-1970s, electronic calculators were becoming smaller, more affordable, and gaining widespread popularity beyond scientific and business settings. The APF Mark 40 was one such model aimed at the growing consumer market. Manufactured in 1975 by APF Electronics in New York and made in Japan, this handy calculator measured …
