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Unisonic LC-7411G

Date of introduction:  1981 Display technology:  LCD
New price:   Display size:  8
Size:  2.2" x 3.9" x 0.20"
 56 x 97 x 5 mm3
   
Weight:  1.5 ounces, 43 grams Serial No:  5917048
Batteries:  2*LR54  Date of manufacture:  year 1981
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8  Integrated circuits:  Sharp LI3033MT
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Does this Unisonic LC-7411GK calculator look familiar to you?

Dismantling the featured LC-7411G manufactured in 1981 by an unknown OEM (Original Equipment Manufacturer) in Taiwan reveals a clean design centered around a Sharp LI3033MT single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by two small LR54 (LR1130) batteries.

Inspecting the PCB of this Unisonic LC-7411G calculator brought our attention to a small mark reading MK75, we spotted this PCB-Mark already with the near identical offspring TI-1754 and suspect to locate it in the MBO Deluxe, too. Based on the PCB-Marks located with the TI-2130 and its twin Technico F-800 we are almost positive that the LC-7411GK and its siblings were manufactured by Inventa Electronics Corporation of Taipei, Taiwan. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.



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

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