Date of introduction:   Display technology:  LCD (yellow)
New price:   Display size:  8
Size:  5.3" x 2.6" x 0.4"    
Weight:  3.2 ounces Serial No:  263785
Batteries:  2*LR44  Date of manufacture:  
AC-Adapter:   Origin of manufacture:  GDR
Precision:  8 Integrated circuits:  T3566
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

You are familiar with this MR411 produced by the former GDR based company RFT ? You are right, this is a perfect copy of the early Texas Instruments Datachron aka TI-1790 or the Toshiba LC-833WA. Read more about their calculator exports here.

Compare the perfection of the copy of the internals with the attached pictures. You'll find the MR411 always on the left side of the pictures.

MR411B.jpg (89529 Byte)

The MR411 uses the original Toshiba T3566 calculator chip found in the TI-1790 design MR411IC.jpg (85882 Byte)
Later even this chip was a target of the eastern "copy cats" and the MR413 appeared.


If you have additions to the above article please email:

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