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DATAMATH CALCULATOR MUSEUM

Texas Instruments Galaxy 9 (1^st design)

Date of introduction:	1992	Display technology:	LCD
New price:		Display size:	8
Size:	3.4" x 5.5" x 0.65" 87 x 140 x 17 mm³
Weight:	3.8 ounces, 108 grams	Serial No:
Batteries:	CR2032	Date of manufacture:	wk 03 year 1993
AC-Adapter:		Origin of manufacture:	Italy
Precision:	11	Integrated circuits:	Toshiba T6A60 (PN1111273)
Memories:	1
Program steps:		Courtesy of:	Joerg Woerner

The Galaxy 9 is almost identical to the Galaxy 9x introduced one year earlier.

The only difference between this two calculators is the behavior handling fractions. While the Galaxy 9x accepts the input of "units" with the u key the Galaxy 9 works with real fractions only.

Calculation	Result Galaxy 9	Result Galaxy 9x
2.5 D-F	25/10	2 u 5/10

Texas Instruments developed in the Galaxy line between 1988 and 1995 three almost identical calculator pairs for the European market. To our knowledge the models with the u key were sold only in Germany.

	Belgium, France, Italy	Germany
Basic-Line	Galaxy 10	Galaxy Junior
Educational-Line	Galaxy 9	Galaxy 9x
Enhanced-Line	Galaxy 40	Galaxy 40x

Dismantling the Galaxy 9 is a surprise, the calculator is 100% identical with the Galaxy 9x. We know from the printed circuit board (PCB) of the earlier Galaxy 10 and Galaxy Junior a small resistor as an assembly option to select between the two calculators. The PCB of this Galaxy 9 sports two solder pads for a resistor in surface mount technology but neither the Galaxy 9 nor the Galaxy 9x makes use of it.

The Galaxy 9 got within one year a changed keyboard design, compare it here.

Don't miss the innovative Casio AL-8 calculators introduced in 1975 and already operating and displaying fractions and the TI-Primaire Plus introduced in 2014.

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