Kmart Corporation KMC 100B

Date of introduction:  1984 Display technology:  LCD
New price:  $11.97 (SRP 1985) 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 1984
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8  Integrated circuits:  Sharp
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Does this KMC 100B calculator sold in 1984 by Kmart Corporation look familiar to you?

Dismantling the featured KMC 100B manufactured in 1984 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 KMC 100B calculator brought our attention to a small mark reading SD9-10, most likely a reference to Type Small Desktop 9 and Revision 1.0 of the design (schematics and layout). We spotted this PCB-Mark already with the near identical offspring TI-1795 and Radio Shack EC-2006A with revisions SD9-13, SD9-14, and SD-9-15. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

In Canada an otherwise identical calculator was sold as KMC 7500C.

IIf you have additions to the above article please email:

Joerg Woerner, March 23, 2020. No reprints without written permission.