Texas Instruments TI-31 SOLAR

Date of introduction:  1988 Display technology:  LCD
New price:   Display size:  8 (5 + 2)
Size:  5.5" x 2.8" x 0.45"
 140 x 72 x 11 mm3
Weight:  2.8 ounces, 78 grams Serial No:  
Batteries:  n.a. Date of manufacture:  wk 22 year 1989
AC-Adapter:   Origin of manufacture:  Italy
Precision:  11 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 3.2 MByte)

TI-31SOLAR_RCI2289_PCB.jpg (87063 Byte)The TI-31 SOLAR is identical to the TI-31 introduced two year earlier. The main difference between the Italian and Japanese products is the size of the solar cells and the internal construction. 

You'll notice these differences with the Japanese BA-SOLAR and the Italian BA-SOLAR, too.

A less sophisticated calculator was introduced with the TI-30 SOLAR.

The calculator was produced both in Italy (shown) and in China with a slightly different design. Find the China version here.

One year later the the appearance of the calculator changed again. Compare it here.


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If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.