Texas Instruments TI-1766 (1st design)

Date of introduction:  1981 Display technology:  LCD
New price:  $19.95 Display size:  8
Size:  4.4" x 2.6" x 0.30"
 112 x 65 x 7 mm3
Weight:  1.7 ounces, 49 grams Serial No:  241557
Batteries:  n.a.  Date of manufacture:  mth 10 year 1981
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  Toshiba T6758S
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

TI-1766_1_Back.jpg (138961 Byte)With the TI-1766 Texas Instruments entered 1981 the market of LCD-calculators powered by solar cells. Compared with Japanese companies this was late, Sharp introduced already in the year 1976 the EL-8026 Sunman and Teal a few months later the Photon.

This calculator was developed and produced in Japan. The electronics of the TI-1766 is based on a Toshiba calculator chip compared with the US chips in the slimline calculators like the TI-1031

TI-1766_1.jpg (66452 Byte)Comparing the TI-1766 with the Toshiba LC-847 gives the impression that the calculator, not only its brain, is is a Toshiba design

TI-1766_1_PCB1.jpg (166210 Byte)TI-1766_1_PCB2.jpg (121529 Byte)The printed circuit board (PCB) inside this TI-1766 manufactured early in 1981. It makes use of the Toshiba T6758S single-chip calculator circuit.

TI-1766_2_PCB.jpg (43319 Byte)In 1982 Texas Instruments changed the design of the TI-1766 slightly by replacing the redundant "SOLAR AND LIGHT POWER" phrase with a more precise "LIGHT POWERED" slogan.

If we trace back the routes of Toshiba calculator chips within the TI-line, we evaluate:

Type Model Introduction First Toshiba IC
Basic TI-1750 (1st) year 1977 T3532, year 1976
Basic SLR TI-1766 year 1981 T6789, year 1981
Scientific TI-25 year 1978 T3636, year 1977
Scientific SLR TI-30 SLR year 1982 T6824, year 1982
Financial none   T6787, year 1982
Financial SLR BA-SOLAR year 1986 T7917, year 1986

It took only a short time between the introduction of a Toshiba calculator chip and the corresponding Texas Instruments calculators. For the financial calculators TI used between the years 1978 and 1986 always their own chips, the missing link could be found with the Canon Financial calculator.

A big advantage of the Toshiba design was the smooth and flawless keyboard. Within two years the TI-1766 got a thinner and much smaller housing with the TI-1776 and a cheaper appearance with the short living TI-1006 and the TI-1706. In 1986 the TI-1766 II was still more valuable than a TI-1706 II. In later years the design of a TI-1766 III was identical with the TI-1706 III

At the same time with the TI-30 SLR the first scientific calculator with solar cells was introduced.

The TI-1766 is featured in the Texas Instruments Incorporated leaflet CL-199M dated 1983.


horizontal rule

If you have additions to the above article please email:

Joerg Woerner, September 20, 2002. No reprints without written permission.