Hand-held Calculators

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Lloyd's Accumatic 100

Lloyds Accumatic 100

Calculator energised with the display cover raised and the display illumination turned on.

Lloyd's Accumatic 100

Distinctive features: The first commercial hand-held calculator with a liquid crystal display (LCD).

Technical details:
Display is 8 digits, reflective Liquid Crystal Display (LCD), illuminated by a filament lamp.

4-function.

Main integrated circuits - Rockwell 10362PB and 2 of 10417PB (here date coded to week 24 and week 26 of 1972).

6v (4 x D cells).

143 mm x 235 mm x 54 mm (5.6" x 9.25" x 2.1").

Introduced 1972.

"Assembled in Mexico primarily of United States parts"
Lloyd's Electronics, Inc., Compton, California., U.S.A.

Pressing the red "Power" button springs the display cover open and turns on the calculator. Pressing the display cover closed switches the calculator off.

Rockwell manufactured this model for Lloyd's and also for Sears.

Inside Lloyds Accumatic 100

Inside the calculator showing, on the right, the filament lamp at the top and the clear plastic light pipe (shaped like half of an ellipse) to illuminate the numbers of the display.

Inside Lloyds Accumatic 100

The circuit board, with the LCD at the top and the 3 Rockwell integrated circuits.

Lloyds Accumatic 100

The calculator held in the hand, showing the large size, with the display cover closed.

The calculator models manufactured by Rockwell for other companies were the first calculators with a Liquid Crystal Display (LCD) to go on sale (see also the Rapid Data Rapidman 1208LC desktop model).
Due to the reflective nature of the numerals of this first generation LCD a filiament lamp is used to illuminate the display from above it. The lamp has a high current consumption requiring the use of four large D cells, though rechargeable ones can be used. This negates the main advantage of the low power consumption of the LCD. Other models (eg. Sharp EL-8001) of this period used a hood over the display with a diffusing window to illuminate the numbers of the display.
The introduction of LCDs in calculators was not smooth. There was much debate about the life expectancy of the Liquid Crystal compounds used in these displays (though this one works perfectly after 30 years) and there appear to have been manufacturing problems. It was to be 3 or 4 years before LCD technology had improved and cost dropped for it to start becoming the dominant display technology of calculators.

See the article "Liquid Crystal Display (LCD) Calculators" on this site for information about other early LCD calculators.

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Hand-held Calculators

TI Cal-Tech
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Sanyo CX-1
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Slide Rule
Otis King L

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© Text & photographs copyright Nigel Tout   2000-2015 except where noted otherwise.