Montgomery Ward electronic D12K aka TXI-8649A

Date of introduction:  1974 Display technology:  Panaplex II
New price:  $119.00 Display size:  12
Size:  8.8" x 6.5" x 2.7"
 224 x 165 x 68 mm3
Weight:  28.8 ounces, 818 grams Serial No:  37D-33047
Batteries:   Date of manufacture:  wk 29 year 1974
AC-Adapter:  120 V Origin of manufacture:  USA
Precision:  12 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Frederick S. Gimble

txi-8649a_1.jpg (100912 Byte)This rare Montgomery Ward electronic D12K desktop calculator reveals itself with the official TXI-8649A designation on the backside label as a Texas Instruments product. The outside of this calculator resembles that of the Radio Shack EC-1000 but contains the feature set of the TI-4000 plus an additional [AD] key.

The electronic D12K fits into a row of three similar desktop calculators:

electronic D8F aka TXI-8647A, based on the TI-3000
electronic D10P aka TXI-8648A, based probably on the TI-3500
electronic D12K aka TXI-8649A, based probably on the TI-4000



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Joerg Woerner, December 30, 2006. No reprints without written permission.