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Texas Instruments TI-1790 II DATACHRON

Date of introduction:  1979 Display technology:  LCD (yellow)
New price:   Display size:  8
Size:  5.3" x 2.6" x 0.4"
 136 x 67 x 11 mm3
   
Weight:  3.2 ounces, 88 grams Serial No:  52083
Batteries:  2*LR44 Date of manufacture:  mth 07 year 1979
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  Toshiba T3566
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

TI-1790II_Back.jpg (82901 Byte)The DataChron, a.k.a. TI-1790-II, replaced the original TI-1790 within one year and seems to be just a stylish variation.

TI-1790II_PCB1.jpg (236418 Byte)TI-1790II_PCB.jpg (231232 Byte)Dismantling the DataChron reveals indeed a more or less identical design centered around a Toshiba T3566 single-chip calculator circuit.



If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, December 5, 2001. No reprints without written permission.