Hand-held Calculators

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apf Mark V

apf Mark V

Switched on and display cover open.

apf Mark V

Distinctive features: One of the first of a long line of hand-held calculators marketed by APF Electronics Inc., of New York.  Has carrying handle, flip-up cover over display, battery-level meter.

Technical details:
Display is 8 digits, green fluorescent in a single tube.

4-function.

Main integrated circuit - Texas Instruments TMS0101 (date coded week 23 1973).

6v (4x C).

120 mm x 188 mm x 40 mm (4.75" x 7.5" x 1.6").

1972/3.

Has battery voltage meter, on left below the display.
Flip up cover over display, opened when the power switch is moved to the ON poistion.

Made in Japan,
APF Corporation INC, New York.

Inside

View inside, showing the large single vacuum-fluorescent display tube and the Texas Instruments TMS0101 'calculator-on-a-chip'.  Also prominent are a number of black discrete transistors, and other components especially for working with the high voltages required by the display tube.

Hand-held Calculators

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2021  except where noted otherwise.