Texas Instruments - Calculator - 1970-1980 - Red LED display

Texas Instruments TI-31 – LED Scientific Calculator – Functional – 1970s – Assembled in Italy

This Texas Instruments TI-31 is an iconic scientific calculator from the late 1970s. Featuring a red LED display, it represents one of the first generations of electronic scientific calculators from Texas Instruments and is now a prized piece among vintage computing collectors.

The offered unit has been tested. The LED display is bright, the digits are clearly legible, and the main keys respond correctly.

The battery compartment is clean, with no signs of oxidation. The device is assembled in Italy, as indicated on the back.

Specifications:
Brand: Texas Instruments
Model: TI-31
Scientific calculator
Red LED display
Power: 9 V battery (PP3)
Assembled in Italy
Visible reference: 1280RCI
Functional

Overall good condition given its age.
Notes:
– operation verified;
– bright and perfectly legible LED display;
– keys functional during testing;
– battery compartment clean, with no corrosion;
– normal signs of use on the front panel and casing;
– presence of a dent/shock on one side of the housing;
– the battery compartment cover no longer fits securely;
– some marks and scratches from use.

The battery visible in the photographs was only used for testing and is not guaranteed.
The photographs are an integral part of the description.
This TI-31 is a representative testament to the evolution of scientific calculators at the end of the 1970s and will naturally find its place in a collection dedicated to vintage electronic or computing objects.