Calculator History

Events

Pascal makes device that performs all four arithmetic operations without humans. He succeeds but doesn’t mass produce the device and doesn’t patent it.

1642

Thomas de Colmar patents and produces Arithmometer, a device that used sliders and cranks to add/subtract/multiply/divide.

1820

Dorr. E. Felts makes the Comptometer, which had buttons

1887

ENIAC filled a room, and weighed 27 tons, but did math completely electronically.

1947

ANITA could do math and fitted on a table, used vacuum tubes to operate.

1961

Programma 101 prints answers on paper and could even be programeed

1965

ELKA 22 made in Bulgaria, could do square roots.

1965

Texas Instruments makes groundbreaking “Cal Tech” prototype. It was handheld and printed answers onto paper.

1967

Sharp QT-8B had fluorescent lights, microchips, and internal power.

1969

TI 2550 was larger than earlier designs, but cheaper too.

1976

Sharp’s EL-8026 had solar panels to provide power.

1978

Casio fx-7000G was first ever graphing calculator.

1985

TI-84 Plus (your graphing calculator) released.

2004