DATAMATH CALCULATOR MUSEUM
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)|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 1.3M Bytes)|
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"
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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© Joerg Woerner, May 13, 2003. No reprints without written permission.