Simpson Sears 41030 Digi·matic 8 

Date of introduction:  1972 Display technology:  LED-modules
New price:  $148.95 Display size:  8
Size:  5.9" x 3.1" x 1.3"    
Weight:  6.9 ounces Serial No:  118290
Batteries:  3*AA NiCd Date of manufacture:  
AC-Adapter:  B905-019-1
 9V AC, 275 mA
Origin of manufacture:  Canada
Precision:  8 Integrated circuits:  TMS0103
Program steps:   Courtesy of:  Joerg Woerner

This Simpson Sears Digi·Matic 8 was manufactured by Bowmar - the inventor of the first "True-Pocket-Size" calculator. Don't miss the famous Bowmar 901B based mainly on components of the Texas Instruments company. 

Digimatic8_PCB.jpg (74256 Byte)Dismantling the Digi·Matic 8 - designed about one year after the 901B - reveals still a pure TI design. We notice the original Klixon™ keypad and the TMS0103 Integrated circuit combined with two display drivers. 

It took another year before Bowmar changed the strategy and replaced TI as supplier of the main components. Find with the Bowmar MX55 a good example of a TI-free product.

horizontal rule

If you have additions to the above article please email:

© Joerg Woerner, May 13, 2003. No reprints without written permission.