DATAMATH CALCULATOR MUSEUM |
Unisonic XL-1105 (Version 1)
Date of introduction: | May 1984 | 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 1984 |
AC-Adapter: | Origin of manufacture: | Taiwan | |
Precision: | 8 | Integrated circuits: | Sharp |
Memories: | 1 | ||
Program steps: | Courtesy of: | Joerg Woerner |
Does this
Unisonic XL-1105 calculator sold in 1984 look familiar to you? It seems to be
identical with the Unisonic XL-1110. And many more
siblings...
Dismantling
the featured XL-1105 manufactured in 1984 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
SD9-11, most likely a reference to Type
Small Desktop 9 and Revision
1.1
of the design (schematics and layout). We spotted this PCB-Mark already with the
XL-1110 and its near identical offsprings
TI-1795 / Radio Shack
EC-2006A with revisions
SD9-13, SD9-14, and SD-9-15. We started compiling a list
of the PCB-Marks on calculators
manufactured by OEMs for Texas Instruments.
The XL-1105 was soon replaced with a 2nd Version sporting smaller solar cells.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, April 13, 2020. No reprints without written permission.