Privileg SOLAR 31

Date of introduction:  1984 Display technology:  LCD
New price:   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:  year 1985
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8  Integrated circuits:  Sharp
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Does this Privileg SOLAR 31 calculator look familiar to you?

Dismantling the featured SOLAR 31 manufactured around 1985 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 Privileg SOLAR 31 calculator brought our attention to a small mark reading SD9-13, most likely a reference to Type Small Desktop 9 and Revision 1.3 of the design (schematics and layout). We spotted this PCB-Mark already with the near identical offspring TI-1795 and started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

Please notice the different sizes of the solar cells used with the SOLAR 31 and TI-1795 despite sporting the same SD9-13 PCB-Mark. Meet Kmart Corporation's KMC 100B - the first born SD9 calculator with Revision 10.

IIf you have additions to the above article please email:

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