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Texas Instruments TI-1795

Date of introduction:  1988 Display technology:  LCD
New price:  $12.00 (SRP 1988) Display size:  8
Size:  4.7" x 4.1" x 1.0"
 120 x 106 x 25 mm3
   
Weight:  3.0 ounces, 86 grams Serial No:  
Batteries:  n.a. Date of manufacture:  mth 08 year 1988
AC-Adapter:   Origin of manufacture:  Taiwan (C)
Precision:  8 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 2.0 MByte)

Just a minor design variation to the original TI-1795 introduced four years earlier. And yes, the bump on key #5 introduced with the TI-1795 in 1985 is still present.

Dismantling this TI-1795 manufactured in August 1988 by Compal Electronics , an OEM (Original Equipment Manufacturer) in Taiwan, reveals a clean design centered around an unknown Sharp single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by solar cells.

Inspecting the PCB of this TI-1795 calculator brought our attention to a small mark reading SD9-15, most likely a reference to Type Small Desktop 9 and Revision 1.5 of the design (schematics and layout). We spotted this PCB-Mark already with the near identical offspring Radio Shack EC-2006A and started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

In 1991 the size of the solar cells was reduced and production of the TI-1795 was shifted to Thailand.

horizontal rule

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

Joerg Woerner, March 4, 2011. No reprints without written permission.