"Standard Type 1" Calculators
By the mid 1970s the components for calculators were mass-produced and basic calculators had become very cheap. This model was one of the cheapest and was sold under many names. It was even given away as an advertising item.
Below are photographs of a few of the many versions of this "Standard Type 1" calculator.
"Standard Type 1"
Distinctive features: A popular, low-cost model, sold under many names.
Display is 8 digits, red LED.
Four function, %, memory.
Integrated circuit - Texas Instruments TMC0972 or TMS0972.
9v (PP3 battery).
69 x 133 x 24 mm (2.75" x 5.25" x 0.95").
Made in Hong Kong.
King Sonic - a typical "Standard Type 1" calculator.
Showing the electronics of this type of calculator. By now there is a just a cheap keyboard, the Texas Instruments TMS0972NL integrated circuit (here date coded to early 1978) and the 8-digit LED display array.
Some Varieties of "Standard Type 1" Calculator
Photo courtesy of Gene Sederholm.
Bowmar (no model number on calculator) MM5 (on box).
A calculator advertising Goodyear tyres - by now calculators were cheap enough to be given away as promotional items.
This model is a late one being sold in March 1980. The 'CS' or '+/-' (Change Sign) key has been replaced by the 'X/Y' key which swaps the numbers of a calculation before the '=' is pressed. The digits of the display are also noticeably smaller.
© Text & photographs copyright Nigel Tout 2000-2021 except where noted otherwise.