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DATAMATH CALCULATOR MUSEUM

Texas Instruments Concept III

Date of introduction:	1976	Display technology:	LED-stick
New price:		Display size:	8 + 2
Size:	5.8" x 3.2" x 1.3"
Weight:	8 ounces	Serial No:	0017847
Batteries:	3*AA	Date of manufacture:	wk 08 year 1976
AC-Adapter:	unknown	Origin of manufacture:	USA
Precision:	8	Integrated circuits:	TMS1016
Memories:	1
Program steps:		Courtesy of:	Joerg Woerner
		Download manual:	(US: 4.302 kB)

Following the path of the Slide Rule (SR) calculators like the wonderful SR-16 the Concept III was called Advanced Slide Rule.

If you explore the calculator deeper (using the pictures on the right donated by Kirk B. Muri) you'll immediately catch the similarities to the SR-16 II. The only differences are the colouring schema of the faceplate and the size of the letters. The slightly oversized keyboard printing was continued later with the TI-1255.

Even the inside view and a deeper look on the backside of the calculator gives us no additional differences to a common SR-16 II. The printed circuit board (PCB) is identical to a SR-16 II.

The backside gives one surprise: A serial number with three leading zeroes! Let us assume that production numbers kept well beyond the marketing expections. Currently we know three Concept III:

	0017847 wk 08 year 1976
	0005066 wk xx year 1976
	0002554 wk 10 year 1976

The Concept line covered three different models: The Concept I based on the TI-1200, the Concept II based on the TI-1250 and this Concept III as a sibbling of the SR-16 II.

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