Texas Instruments TI-1766 (3nd design)

Date of introduction:  1983 Display technology:  LCD
New price:  
 $18 (October 1981)
Display size:  8
Size:  4.6" x 2.6" x 0.35"    
Weight:  1.9 ounces Serial No:  296671
Batteries:  n.a.  Date of manufacture:  mth 06 year 1983
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  Toshiba T6789S
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

With the TI-1766 Texas Instruments entered 1981 the market of LCD-calculators powered by solar cells. 

The printed circuit board (PCB) inside this TI-1766 manufactured mid of 1983 carries the designation "Toshiba TI-1766II" and sports a Toshiba T6789S single-chip calculator circuit instead the previous T6758S. Due to the lower supply voltage of this design the solar cells made use of just 4 elements.

How to distinguish between the
2nd design and this 3rd design? 

  2nd design 3rd design 
Solar cells 10 elements 4 elements
PCB revision TI-1766 SOLAR TI-1766II
Calculator chip Toshiba T6758S Toshiba T6789S

TI-1766_CMP.jpg (58845 Byte)The 1st design of the TI-1766 was derived from the Toshiba LC-847, this 3rd design is almost a twin of the Toshiba LC-847 II

In the meantime we discovered a 4rd design of the TI-1766 using another calculator chip and a different logo. Don't miss it.

Don't miss the rare Teal Photon, the World's first pure solar-powered calculator!

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If you have additions to the above article please email:

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