Texas Instruments TI-1250

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 colourful TI-1255 and the rare CONCEPT II, too.

Within one year the colour of the display frame was changed from gold to silver, view the new design 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)

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

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