Iain Jones International
Addison Mini A
Iain Jones International Addison Mini A
Display is 8 digits, red LED.
4-functions.
9v (PP3) rechargeable, see photograph of the rear, above.
Has a battery-level meter, just above the left end of the display.
Main integrated circuit is a General Instrument C550, here date coded early 1973.
80 x 149 x 28 mm (3.1" x 5.9" x 1.1").
c1973.
Designed and manufactured by Iain Jones International , Ltd, Atlanta, Georgia, U.S.A.
With the casing removed, showing the Texas Instruments "Klixon" keypad, and the circuit board with the gold coloured GI C550 integrated circuit, which was a very common calculator integrated circuit at this time.
To the right of the LED display is the battery-level meter.
In the early 1970s the number of electronics components in a calculator had reduced but were still fairly costly. A number of small electronics companies, especially in the U.S.A., saw the opportunity of
manufacturing calculators and making a profit. Iain Jones International Ltd. is one such company and, like many of them, little is known about it apart from a small number of models of calculator which turn up.
With the ever
reducing cost of the electronics components and the number of companies starting to mass-produce calculators, the selling price of calculators plummetted and the profits from manufacturing them dwindled. Most of these small
companies dropped out of the calculator business after a year or two.
This model is an interesting example. It uses the GI C550 integrated circuit, which was a very common calculator integrated circuit at this time, together with the Texas Instruments Klixon keypad, but unusually it makes use of a 9v PP3 rechargeable battery and is one of the smallest calculators to have a battery-level meter.
To see more calculators from companies that only produced one or two models see the article "One Hit Wonders" in the Collecting Calculators section of this site.
