Texas Instruments TI-502 (RED)

Date of introduction:  1987 Display technology:  LCD
New price:   Display size:  8
Size:  4.4" x 2.6" x 0.75"
 113 x 66 x 19 mm3
Weight:  1.6 ounces, 45 grams Serial No:  
Batteries:  LR1130 Date of manufacture:  mth 01 year 1991 (A)
AC-Adapter:   Origin of manufacture:  Thailand (C)
Precision:  8 Integrated circuits:  Sharp LI3135
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

The TI-502 was one of the very cheap calculators sold by Texas Instruments. A small, slanted housing, rubber keys and a battery enhanced by a colorful type designation. That's it! 

Between 1986 and 1987 four different colorings appeared:

TI-502 red
TI-502 blue
TI-502 yellow
TI-502 black

Dismantling this TI-502 calculator manufactured in January 1991 by Cal-Comp Electronics in Thailand reveals a clean design centered around a Sharp LI3135 single-chip calculator circuit.

Production of the TI-502 was shifted 1991 from Taiwan to Thailand.


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If you have additions to the above article please email:

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