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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
   
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.

 

 




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

Joerg Woerner, February 17, 2003. No reprints without written permission.