DATAMATH CALCULATOR MUSEUM
Royal DT 80
|Date of introduction:||1985||Display technology:||LCD|
|New price:||Display size:||8|
|Size:|| 4.7" x 4.1" x
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|
|Program steps:||Courtesy of:||Joerg Woerner|
Royal DT 80 calculator sold in 1986 look familiar to you?
Dismantling the featured DT 80 manufactured in 1986 by Compal 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 DT 80 brought our attention to a small mark reading SD9-14, most likely a reference to Type Small Desktop 9 and Revision 1.4 of the design (schematics and layout). We spotted this PCB-Mark already with the near identical offspring TI-1795 and 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.
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© Joerg Woerner, April 13, 2020. No reprints without written permission.