Calculator - Navo

• An electronic calculator is a small, portable electronic device used to perform both basic and complex operations of arithmetic.
• The first solid state electronic calculator was created in the 1960s, building on the extensive history of tools such as the abacus, developed around 2000 BC, and the mechanical calculator, developed in the 17th century.
• Modern electronic calculators vary from cheap, give-away, credit-card-sized models to sturdy desktop models with built-in printers.
• Computer operating systems as far back as early Unix have included interactive calculator programs such as dc and hoc, and calculator functions are included in almost all PDA-type devices (save a few dedicated address book and dictionary devices).
• The first known tools used to aid arithmetic calculations were bones (used to tally items), pebbles and counting boards, and the Abacus, known to have been used by Sumerians and Egyptians before 2000 BC.