Texas Instruments TI-1270

Date of introduction:  April 21, 1976 Display technology:  LED-stick
New price:  $18.95 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:  0011144
Batteries:  9V  Date of manufacture:  wk 30 year 1976
AC-Adapter:  AC9180 Origin of manufacture:  USA (LTA)
Precision:   Integrated circuits:  TMS0974
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 2.3 MByte)
  (EU: 3.5 MByte)

TI-1270_USA_Back.jpg (186020 Byte)The colorful TI-1270 was introduced as a late member into the growing TI-1200 family. Is it a basic calculator or a scientific calculator? Compare it with the SR-11, introduced only 2 years earlier as a powerful scientific calculator.

Within the Datamath Museum the decision was made based on the technology, we'll keep it in the Basic Album. If your read more about the calculator chip inside the calculator you'll notice the similarity to the TI-1200.

TI-1270_USA_PCB.jpg (122897 Byte)Dismantling the TI-1270 reveals a printed circuit board (PCB) identical with the later production runs of the TI-1200 and TI-1250 calculators. The only change is the single-chip calculator circuit, we located a TMS0974 instead the TMS0972.

We located recently a TI-1270 sporting a almost red faceplate, we are not sure if this color was intended or is simply a quality issue.

A similar calculator was sold as Citation M4988 from the distribution company Western Auto.

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Joerg Woerner, June 20, 2009. No reprints without written permission.