DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1780
|Date of introduction:||1984||Display technology:||LCD|
|New price:||DM 17.30||Display size:||8|
|Size:|| 2.3" x 3.9" x
58 x 99 x 7 mm3
|Weight:||1.3 ounces, 37 grams||Serial No:||0050799|
|Batteries:||n.a.||Date of manufacture:||mth 09 year 1983|
|AC-Adapter:||Origin of manufacture:||Taiwan (C)|
|Program steps:||Courtesy of:||Joerg Woerner|
TI-1780 looks like a TI-1706 in credit card format. You can't compare it with
the stylish TI-1754 introduced a few years earlier.
Dismantling the featured TI-1780 calculator manufactured in September 1983 by a non-disclosed Original Equipment Manufacturer (OEM) in Taiwan reveals a very clean design centered around an unknown single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by four solar cells.
Inspecting the PCB of this TI-1780 calculator brought our attention to a small mark reading S4T-10, together with the leading "C" in the Date code of the calculator we assume that it was manufactured by Cal-Comp Electronics. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
Later credit card sized calculators like the TI-1786 sport an even simpler design.
Don't miss the Casio FILM CARD SL-800, a real credit card sized calculator with a thickness of only 0.030".
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, September 29, 2002. No reprints without written permission.