Texas Instruments TI-1250 (Version 4, Hong Kong)

Date of introduction:  April 1977 Display technology:  LED-stick
New price:   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:  1037019
Batteries:  9V  Date of manufacture:  wk 25 year 1977
AC-Adapter:  AC9180 Origin of manufacture:  Hong Kong (HK)
Precision:  8 Integrated circuits:  TMS0972
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manuals:   (US: 2.5M Bytes)
  (EU: 3.5M Bytes)

TI-1250_HK_1.jpg (256454 Byte)Production of the TI-1250 was eventually brought to Hong Kong, probably to lower manufacturing costs during the Calculator Wars.

Dismantling this TI-1250 manufactured mid of 1977 in Hong Kong reveals the latest evolution of the TI-1200/TI-1250 family:

The TMS0972 single-chip calculator circuit in a 0.4 wide 28-pin SPDIP (Shrink Plastic Dual In-line Package with a 0.07 / 1.778 mm lead pitch) without any additional passive components soldered on a single-sided printed circuit board with an 8-digit LED display.

Learn more about the evolution of the TI-1250 between June 1975 and its discontinuation in 1977.

Learn more about the different Product Labels used with the TI-1250 - here at the Datamath Calculator Museum we classify the featured TI-1200 as Hardware Version 4, PCB Type 3 and Product Label Style 4, A-Series.


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Joerg Woerner, November 26, 2008. No reprints without written permission.