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DATAMATH CALCULATOR MUSEUM

Texas Instruments professional distributed by Koh-I-Noor Hardtmuth

Date of introduction:	1977	Display technology:	LED-stick
New price:		Display size:	8 (5 + 2)
Size:	5.8" x 3.1" x 1.4" 148 x 78 x 36 mm³
Weight:	4.0 ounces, 114 grams	Serial No:	429273
Batteries:	9V or RK2	Date of manufacture:	wk 09 year 1978
AC-Adapter:	AC9900/R	Origin of manufacture:	Italy (RCI)
Precision:	10	Integrated circuits:	TMS0981
Memories:	1
Program steps:		Courtesy of:	Marie Lisa Collas

Texas Instruments professional? We were really surprised to receive in September 2014 a link from fellow collector Marie Lisa Collas to this unusual looking calculator on the Italian eBay site. It is obvious that the model professional - manufactured for Koh-I-Noor Hardtmuth - is a hybrid of three different products:

• The basic functionality is borrowed without any doubts from the TI-30 introduced in 1976
• The double-shot injection molded keys are known from the Business Analyst-I
• The yellow-brown keyboard plate is... unique

Dismantling this model professional manufactured in 1978 reveals a standard TI-30 printed circuit board (PCB) with the well-known TMS0981 single-chip calculator circuit.

This unique professional followed early in 1978 the model 40 and was replaced already in 1979 with the model 30/super. Don't miss the unique model 45, Studio 29 and colorful SILCA 48.

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