Texas Instruments TI-1750-II

Date of introduction:  1980 Display technology:  LCD (yellow)
New price:  $17.50 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:  108334
Batteries:  2*LR54  Date of manufacture:  mth 07 year 1980
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  Toshiba T3709
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 2.6M Bytes)

You could call this calculator the small brother of the TI-1750. It uses a very similar electronic in a slightly smaller housing than its predecessor. The calculator was available till the year 1982.

Disassembling the featured TI-1750-II with Date code 070 and manufactured in July 1980 by Toshiba Corporation in Japan reveals a simple construction and a very clean layout centered around a Toshiba T3709 single-chip calculator circuit soldered on a single-sided printed circuit board (PCB) and powered by 2 small LR54 batteries. One of the tricks we noticed is a keyboard assembly with rubber keys instead the plastic molded keys of similar calculators. The Toshiba T3709 chip was used with the 3rd version of the TI-1750, too.

Inspecting the PCB of this TI-1750-II calculator brought our attention to a small mark reading TI-1750II TOSHIBA CORP. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

Toshiba? Compare this calculator with the Toshiba LC-825.

If you have additions to the above article please email:

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