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Texas Instruments TI-1795+ (1998 Nam Tai)

Date of introduction:  1998 Display technology:  LCD
New price:   Display size:  8
Size:  5.1" x 4.2" x 1.0"
 130 x 106 x 26 mm3
   
Weight:  3.3 ounces, 94 grams Serial No:  
Batteries:  n.a. Date of manufacture:  mth 05 year 1998
AC-Adapter:   Origin of manufacture:  China (N)
Precision:  8 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woernerr

At first glance looks this TI-1795+ almost identical to the first design of the TI-1795+, main differences are the slightly rounder design of the housing and a new layout of the keys in the left column.

Dismantling this TI-1795+ manufactured in May 1998 by Nam Tai Electronics in China reveals a clean design centered around an unknown single-chip calculator circuit mounted in Chip-on-Board (COB) technology on a small double-sided printed circuit board (PCB) and powered by small solar cells. A larger, single-sided PCB is used for the keyboard and connected with a short flat flexible cable (FFC). Please compare with a TI-1795+ manufactured three month later by Kinpo Electronics still using a conventional Flat Pack (FP) housing and just one PCB.

Inspecting the PCBs of this TI-1795+ calculator brought our attention to two small marks reading TI-1795NP JP302-2 resp. TI-1795NP JP307-2 while its stable mate manufactured by Kinpo Electronics is marked with SD29-11. We spotted a very similar PCB-Mark already with the Radio Shack EC-2006A and Privileg SOLAR 31. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

The Second Generation of the TI-1795+ was introduced in January 1996 and an interesting journey around the Globe began:

TI-1795+ Second Generation Prototype Kinpo Electronics (Taiwan), June 1994
TI-1795+ Second Generation Cal-Comp Electronics (Thailand), October 1995 and April 1998
TI-1795+ Second Generation Nam Tai Electronics (China), May 1998
TI-1795+ Second Generation Kinpo Electronics (China), August 1998

Within four years this TI-1795+ was replaced with the TI-1795SV (SuperViewTM). Compare it with the TI-1800 and the odd TI-808.

A similar calculator with 10 digits of display capability was sold with the TI-1796+.



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

Joerg Woerner, March 16, 2020. No reprints without written permission.