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"
 138 x 70 x 35 mm3
Weight:  3.9 ounces, 110 grams 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:   (EU: 3.5 MByte)

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 version of the TI-1250. Don't miss the colorful TI-1255 and the rare CONCEPT II.

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 eventually shifted to Hong Kong, view one of them here.

The Dutch department 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 leaflets ER-1975 and ER-1976 dated 1975 resp. 1976.

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If you have additions to the above article please email:

Joerg Woerner, January 4, 2002. No reprints without written permission.