DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1755 SLR
|Date of introduction:||1983||Display technology:||LCD|
|New price:||Display size:||8|
|Size:|| 4.0" x 2.4" x 0.25"
102 x 61 x 6 mm3
|Weight:||1.6 ounces, 44 grams||Serial No:||552243|
|Batteries:||n.a.||Date of manufacture:|
|AC-Adapter:||Origin of manufacture:||Taiwan|
|Program steps:||Courtesy of:||Joerg Woerner|
a nice calculator, this TI-1755 SLR introduced in 1983. But it lost the beeper of the original TI-1755.
Dismantling this TI-1755 SLR manufactured around 1983 by Inventa Electronic Corporation, an OEM (Original Equipment Manufacturer) in Taiwan reveals a clean design centered around an unknown single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by five rather large solar cells.
Inspecting the PCB of this TI-1755 SLR calculator brought our attention to a small mark reading ITI1755 01D while the TI-1755 and TI-1756 exhibit a more generic MK75 PCB-Mark. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
While the TI-1754, TI-1755, TI-1756 and TI-1757 II can't deny their Inventa / Inventec DNA, puzzled us this TI-1755 SLR for quite some time. The PCB-Marks seem to suggest Inventa Electroics Corporation as its manufacturer, but the design (layout and font) of its keyboard suggested different. We finally were able to obtain a Technico SL-674CK calculator and found proof of our assumption. Don't miss a detailed tear-down of the two relatives and read more about the Technico F-1 and its offspring TI-1786.
Fellow collector Stefan Klaes discovered recently a TI-1755 SLR with a slightly modified design.
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© Joerg Woerner, June 13, 2003. No reprints without written permission.