DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1780
| Date of introduction: | 1984 | Display technology: | LCD |
| New price: | DM 17.30 | Display size: | 8 |
| Size: | 2.3" x 3.9" x
0.28" 58 x 99 x 7 mm3 |
||
| Weight: | 1.3 ounces, 37 grams | Serial No: | 0050799 |
| Batteries: | n.a. | Date of manufacture: | mth 09 year 1983 |
| AC-Adapter: | Origin of manufacture: | Taiwan (C) | |
| Precision: | 8 | Integrated circuits: | |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
This
TI-1780 looks like a TI-1706 in credit card format. You can't compare it with
the stylish TI-1754 introduced a few years earlier.
Dismantling the featured TI-1780 calculator manufactured in September 1983 by a non-disclosed
Original Equipment Manufacturer (OEM) in
Taiwan reveals a very clean design centered around an
unknown single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by
four solar cells.
Inspecting
the PCB of this TI-1780 calculator brought our attention to a small mark reading
S4T-10, together with the leading "C" in the
Date code of the calculator we assume that it
was manufactured
by
Cal-Comp
Electronics. We started compiling a list of the
PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
Later credit card sized calculators like the TI-1786
sport an even simpler design.
Don't miss the Casio FILM CARD SL-800, a real credit card sized calculator with a thickness of only 0.030".
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, September 29, 2002. No reprints without written permission.