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

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