DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1776
| Date of introduction: | 1982 | Display technology: | LCD |
| New price: | Display size: | 8 | |
| Size: | 3.7" x 2.2" x 0.25" 95 x 56 x 6 mm³ |
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| Weight: | 1.2 ounces, 34 grams | Serial No: | 177119 |
| Batteries: | n.a. | Date of manufacture: | mth 12 year 1982 |
| AC-Adapter: | Origin of manufacture: | Japan | |
| Precision: | 8 | Integrated circuits: | Toshiba T6789S |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
At
first glance seems the TI-1776 almost identical with the TI-1766,
the first solar powered calculator introduced by Texas Instruments. The main
difference is a much smaller and thinner housing, engineers of Toshiba, Japan
shrank the calculator in all three dimensions by about 20%.
Disassembling
the featured TI-1776 manufactured in December 1982 by Toshiba in Japan reveals a smart construction and a very clean layout
centered around a Toshiba T6789S single-chip calculator circuit soldered on a
single-sided printed circuit board (PCB) and powered by 6 solar cells. One of the
tricks we noticed is a keyboard assembly with rubber keys instead the plastic
molded keys of similar calculators. The Toshiba T6789S chip was used with the 3rd version of the TI-1766
and the TI-1006, too.
Inspecting
the PCB of this TI-1776 calculator brought our attention to a small mark reading
TI-1776II TSB obviously for TI-1776 and ToShiBa.
We started compiling a list of the
PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, April 25, 2008. No reprints without written permission.