Texas Instruments TI-31

Date of introduction:  1986 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:  591701
Batteries:  n.a. Date of manufacture:  mth 06 year 1987
AC-Adapter:   Origin of manufacture:  Japan (T)
Precision:  11 Integrated circuits:  Toshiba T6974S
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 3.2 MByte)

At first glance the TI-31 added just a few conversions and statistical functions to the TI-30 Challenger.

If you explore the calculator closer, you'll discover
the electronics of the earlier TI-30 SLR. Texas Instruments continued in 1986 the Toshiba-built calculators with this TI-31 and the great BA-SOLAR.

Only few month after production of the TI-31 was launched in Japan, a first redesign introduced both smaller solar cells and a new designation TI-31 SOLAR

In a next step the production of this design was shifted to China. The calculator kept the name plate TI-31 SOLAR and uses identical housing parts and printed circuit boards.

The later Italian version of the TI-31 SOLAR looks completely different. View the Italian TI-31 SOLAR and BA-SOLAR for a brief comparison.

The featured TI-31 seems to be identical to the later TI-30 SLR+ and the TI-35 SLR

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


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If you have additions to the above article please email:

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