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.

TI-1755SLR_PCB.jpg (46856 Byte)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.