DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1775+
| Date of introduction: | 1996 | Display technology: | LCD |
| New price: | Display size: | 8 | |
| Size: | 6.1" x 5.3" x 0.5" 156 x 134 x 12 mm3 |
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| Weight: | 3.2 ounces, 91 grams | Serial No: | |
| Batteries: | LR44 | Date of manufacture: | mth 01 year 1997 |
| AC-Adapter: | Origin of manufacture: | Thailand (C) | |
| Precision: | 8 | Integrated circuits: | |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
Texas
Instruments introduced already in 1990 with the original TI-1775
a calculator using a foldable housing. The TI-1775+ added a simple clock to the
basic calculator functionality and matches the styling
of the TI-307+ and TI-2200+.
Dismantling
this TI-1775+ manufactured in January 1997 by
Cal-Comp
Electronics in Thailand reveals a rather simple construction based on an
unknown
single-chip calculator circuit mounted in Chip-on-Board (COB) technology on a
double-sided printed circuit board (PCB) and powered by four small solar cells
and a LR44 backup battery for the clock.
Inspecting
the PCB of this TI-1775+ calculator brought our attention to a small mark reading CL7-13 and we started compiling a list of the
PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
IIf you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, February 17, 2003. No reprints without written permission.