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Texas Instruments TI-1766 II

Date of introduction:  1986 Display technology:  LCD
New price:   Display size:  8
Size:  4.6" x 2.5" x 0.35"
 117 x 63 x 8 mm³
   
Weight:  1.9 ounces, 55 grams Serial No:  
Batteries:  n.a. Date of manufacture:  mth 03 year 1986
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  8 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
Download leaflet:   (US: 1.1 MByte)    

With the TI-1766 Texas Instruments entered already in 1981 the market of basic LCD-calculators powered by solar cells. Due to the improvements of both the power consumption of the calculator electronics and the efficiency of the solar cells the size of the solar cells usually was shrunken from model year to model year.

This TI-1766 II introduced in 1986 continued this trend and its solar cells are just about half the size of the ones found in a TI-1766 (4rd design) introduced in 1983. In the meantime we discovered even from the TI-1766 II three different versions and it is difficult to understand, why the 2nd design – introduced in 1987 – increased the size of the solar cells dramatically!

Digging deeper into similar Texas Instruments solar-powered calculators of that era revealed a big surprise: There was obviously a switch back to larger solar cells in 1986. This may be illustrated best by the TI-60x series of calculators and their siblings TI-1768:

Calculator   

Introduction   

Manufactured   

Solar cells

TI-603

1986

11/85

Small

TI-1766 II

1986

03/86

Small

TI-606

1986

06/86

Large

TI-1768

1986

03/87

Large

TI-1766 II

1987

07/87

Large

TI-606

1987

05/87

Medium

TI-1766 II

1989

10/90

Small

TI-1768

1989

06/89

Small

TI-606

1989

08/91

Small


Dismantling the TI-1766 II reveals a standard design of a far-east design of the 80's and reveals the manufacturer of the calculator but not the single-chip calculator circuit. Deciphering the date code "I-0386" points to Inventec Corporation, Taiwan. 

 

 



The TI-1766 II is featured in the Texas Instruments Incorporated bulletin CL-889 dated 1986.

 

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If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, April 28, 2008. No reprints without written permission.