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 Cal-Comp 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.

If you have additions to the above article please email:

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