Hand-held Calculators

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Sharp EL-120

Sharp EL-120

Sharp EL-120

Distinctive features: Low-cost calculator - 3 digit display. Has counter function.

Technical details:
Display is 3 digits, green vacuum fluorescent. Calculates with 9 digits, but only displays 3 digits at a time, see below.

4-function. Also has a "count" trigger (white wedge-shapped button under the display); each time it is pressed it adds 1 to the display.

4.5v (3x AA batteries).

168 x 68 x 21 mm.

~1973.

Made in Japan.

This was Sharp's answer to the very low cost Casio Mini.

 

One way of reducing the cost of a calculator was to reduce the number of digits shown on the display. Using 6 digits was quite common, and the Royal Digital III used 4 digits, but this calculator took this to the extreme.

Circuit board

The circuit board with the single integrated circuit from Hitachi and the 3-digit vacuum fluorescent display tube.

Display

The display after entering 123456789.
The " indicates that there are two more display-full's of digits to be displayed.

Display

The display after pressing the yellow -> key once reveals the next three digits.

Display

The display after pressing the yellow -> key a second time reveals the final three digits.

Hand-held Calculators

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2017  except where noted otherwise.