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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
Precision:	8	Integrated circuits:
Memories:	1
Program steps:		Courtesy of:	Joerg Woerner

Still 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.

If you have additions to the above article please email: joerg@datamath.org.