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Texas Instruments TI-1626

Date of introduction:  1985 Display technology:  LCD
New price:   Display size:  8
Size:  2.2" x 3.3" x 0.25"
 57 x 84 x 6 mm3
   
Weight:  0.8 ounces, 23 grams Serial No:  
Batteries:  n.a. Date of manufacture:  mth 07 year 1985
AC-Adapter:   Origin of manufacture:  Taiwan (C)
Precision:  8 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 1.3M Bytes)

The TI-1626 could be called one of the smallest, thinnest and lightest calculators manufactured by Texas Instruments. Compare it with the TI CARD calculator TI-1786 and the TI-1606 "Portrait-Style" calculator.

Dismantling the featured TI-1626 - a non-reversible process -  manufactured in July 1985 by a non-disclosed Original Equipment Manufacturer (OEM) in Taiwan for Texas Instruments reveals a clean design centered around an unknown single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by four small solar cells and surrounded by just a few discrete components.

We noticed a rather unusual electrical connection between the solar cells and the PCB with a flexible PCB.

Inspecting the PCB of this TI-1626 calculator brought our attention to a small mark reading S44T-11, together with the leading "C" in the Date code of the calculator we assume that it was manufactured by Cal-Comp Electronics. We noticed a similar mark reading S4T-10 already with the TI-1780 introduced in 1984 and started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

Within one year Texas Instruments introduced the TI-505, a much more colorful calculator using an otherwise identical construction.



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

Joerg Woerner, May 13, 2003. No reprints without written permission.