Unisonic XL-1105 (Version 2)

Date of introduction:  January 1986 Display technology:  LCD
New price:   Display size:  8
Size:  4.7" x 4.1" x 1.0"
 120 x 106 x 25 mm3
Weight:  3.0 ounces, 86 grams Serial No:  
Batteries:  n.a.  Date of manufacture:  year 1986
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8  Integrated circuits:  Sharp
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Does this 2nd Generation Unisonic XL-1105 calculator sold in 1986 look familiar to you?

Dismantling the featured XL-1105 manufactured in 1986 by Cal-Comp Electronics, an OEM (Original Equipment Manufacturer) in Taiwan, reveals a clean design centered around an unknown Sharp single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by solar cells.

Inspecting the PCB of this XL-1105 calculator brought our attention to a small mark reading SD9U-11, most likely a reference to Type Small Desktop 9 Unisonic and Revision 1.1 of the design (schematics and layout). We spotted a very similar PCB-Mark reading SD9T-10 already with the near identical offspring TI-508 and started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

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Joerg Woerner, April 13, 2020. No reprints without written permission.