FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -In 1957, the Model 14-A, released by Casio, came onto the scene-a mostly electric calculator that utilized relay technology and was built into a desk. The first solid state electronic calculator became available in the early 1960s, though pocket-size calculators were not available to the public until the 1970s.

Detailed explanation-2: -An abacus is a device composed of beads that slide along rods, which fit into a frame. In ancient times, the abacus was used as a calculator; it aided in performing mathematical processes like counting, addition, subtraction, and multiplication.

Detailed explanation-3: -In 1642, the Renaissance saw the invention of the mechanical calculator (by Wilhelm Schickard and several decades later Blaise Pascal), a device that was at times somewhat over-promoted as being able to perform all four arithmetic operations with minimal human intervention.

Detailed explanation-4: -The abacus (plural abaci or abacuses), also called a counting frame, is a calculating tool which has been used since ancient times.