Radio Shack EC-2006A (65-962A)

Date of introduction:  1984 Display technology:  LCD
New price:  $14.95 (SRP 1985 EC-2006)
 $12.95 (SRP 1986 EC-2006A)
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 1986
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8  Integrated circuits:  Sharp LI3135MS
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Does this Radio Shack EC-2006A calculator look familiar to you?

Dismantling the featured EC-2006A manufactured in 1986 by Compal Electronics, an OEM (Original Equipment Manufacturer) in Taiwan, reveals a clean design centered around a Sharp LI3135MS single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by solar cells.

Inspecting the PCB of this Radio Shack EC-2006A calculator brought our attention to a small mark reading SD9-14, most likely a reference to Type Small Desktop 9 and Revision 1.4 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. Meet Kmart Corporation's KMC 100B - the first born SD9 calculator with Revision 10.

The EC-2006A was soon replaced with the EC-2008 sporting 10-digits capacity and dropping the [+/-] key while introducing an [AC] key.

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Joerg Woerner, March 15, 2020. No reprints without written permission.