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Texas Instruments TI-1750 (1st design)

Date of introduction:  April 1977 Display technology:  LCD (yellow)
New price:  $24.95, 18.95 Display size:  8
Size:  4.5" x 2.7" x 0.35"    
Weight:  2.0 ounces Serial No:  213387
Batteries:  3*LR44  Date of manufacture:  mth 07 year 1977
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  Toshiba T3532
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 0.8 MByte)

With the TI-1750 Texas Instruments entered 1977 the market of LCD-calculators. Due to their high manufacturing costs in the beginning of the epoche, TI introduced the LED calculator TI-1000 as cheap alternative. The TI-1750 was manufactured about 3 years but got five different versions. Read more about the history of the TI-1750 here.

Concerning LCD-calculators Texas Instruments was far behind Japanese companies. Sharp Corporation started sales already in the year 1973 with the EL-805 sporting a silver-coloured COS-LCD display. If you restrict the comparison on the first calculator using the yellow-screen FEM-type display you find the Casio's Pocket LC introduced in the year 1975, the Sharp EL-8020, Toshiba's LC-810 and finally the Canon LC-1.  

It took another 4 years between the TI-1750 and the TI-1766 using solar cells instead the batteries. This was around 5 years behind Sharp's rare EL-8026 Sunman and Teal's Photon.

The reverse side of the PCB gives you an early T3532 calculator chip manufactured by Toshiba. Please notice the contacts for the keys and the LC-display. TI-1750_V1_PCB.jpg (79212 Byte)
The electrical connection between the PCB and the LCD is built with 30 small springs ! Later designs used the "zebra-strips", a stacked sandwich of rubber and conductive elemtents. The keyboard is a sheet of rubber with small conductive elements. TI-1750_V1_LCD.jpg (26130 Byte)
This rare 1st design of the TI-1750 uses 3 batteries under a sliding door. TI-1750_V1_BAT.jpg (46151 Byte)

This TI-1750 calculator was produced in Japan in opposite to the later US origin of the slimline models like the TI-1030 and is somewhat larger. The electronics of the TI-1750 is based on a Toshiba design similar to the later Canon LC-8M. The first US built LCD calculator from Texas Instruments was the odd TI-1700 DATACLIP

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.

It was not unusual for Texas Instruments to start an epoche with Japanese technology and move later to US developments. You'll find similar approachs from the TI-25 to the TI-50.

Only few weeks after the market introduction of the TI-1750 another important calculator appeared, don't miss the TI-59.


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

Joerg Woerner, May 15, 2002. No reprints without written permission. 


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