DATAMATH CALCULATOR MUSEUM

Texas Instruments TI-1250

Date of introduction:	June 1, 1975	Display technology:	LED-stick
New price:	$24.95	Display size:	8
Size:	5.5" x 2.8" x 1.4"
Weight:	5.5 ounces	Serial No:	27669
Batteries:	9V	Date of manufacture:	wk 37 year 1975
AC-Adapter:	AC9180	Origin of manufacture:	USA
Precision:	8	Integrated circuits:	TMS0952
Memories:	1
Program steps:		Courtesy of:	Joerg Woerner
		Download manual:	(US: 1.954 kB)

Introduced three month later than the TI-1200 the TI-1250 was the "fully loaded" design. Basically both calculators were identical, most important was the higher sales margin during the price wars due to the additional memory.

The later TI-1450 was nothing else than a cosmetically enhanced variant of the TI-1250, view the colorful TI-1255 and the rare CONCEPT II, too.

Within one year the color of the display frame was changed from gold to silver, view the new design here. Production of the TI-1250 was eventaully shifted to Hong Kong, view one of them here.

The Dutch depoartment store HEMA sold an identical model as reactor 1250. A similar model was sold by Western Auto as the electronic Wizard M4987 and True Value Hardware with the model T-1225.

The basic calculator integrated circuit (IC) of this design was the TMS0952. With the TMS0972 manufacturing costs of the TI-1250 were lowered. Read more about the differences between the TMS0952 and TMS0972 here.

This chip was used by a lot of manufacturers, even National Semiconductor doing their one calculator chips used it. Explore the NS835A, Bohsei 3000, Conic EL-601 and Privileg 842M.

Don't miss the rare TI-1255 !

Press the X-RAY button and view the internals of a TI-1250.
(Pictures provided by Edward Soudentas)

The TI-1250 is featured in the Texas Instruments Deutschland GmbH brochure ER-1976 dated 1976.

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