Texas Instruments 45 distributed by Koh-I-Noor Hardtmuth

Date of introduction:  1977 Display technology:  Fluorescent
New price:   Display size:  8 (5 + 2)
Size:  5.8" x 3.1" x 1.4"
 148 x 78 x 36 mm3
Weight:  5.0 ounces, 142 grams Serial No:  416678
Batteries:  BP8, BP9 Date of manufacture:  wk 09 year 1978
AC-Adapter:  AC9900/R Origin of manufacture:  Italy (RCI)
Precision:  10 Integrated circuits:  TMC1983
Logic:  AOS - 4 Pending Operations, 15 ()    
Memories:  1    
Program steps:   Courtesy of:  Fabrizio Corpetti

Texas Instruments 45? We were really surprised to locate in December 2021 this unusual looking calculator on the Italian eBay site. It is obvious that the model 45 - manufactured exclusively for Koh-I-Noor Hardtmuth - is based on the European TI-45 but changed the appearance dramatically by replacing the black faceplate with a yellow-brown one.

Dismantling this model 45 manufactured in February 1978 by Texas Instruments in their Rieti, Italy facility reveals a standard TI-45 printed circuit board (PCB) with the well-known TMC1983 single-chip calculator circuit.

Interesting to see the model 45 pictured on the Koh-I-Noor product manual with a faceplate colored like a Business Analyst-I.

Don't miss the similar looking model 40 and the model Studio 29

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Joerg Woerner, November 25, 2022. No reprints without written permission.