Texas Instruments TI-1270 (Version 1)

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/ZA0355
Memories:  1 Displays:  DIS233G
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 2.3M Bytes)
  (EU: 3.5M Bytes)

TI-1270_USA_Back.jpg (186020 Byte)The colorful TI-1270 was introduced in April 1976 as a 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 featured TI-1270 with Date code 3076 LTA and manufactured in July 1976 in Lubbock, Texas reveals a printed circuit board (PCB) identical with the Hardware Version 3 of the TI-1200 and TI-1250 calculators. The only change is the single-chip calculator circuit, we located a TMS0974 instead the TMS0972.

Learn more about the evolution of the TI-1250 between June 1975 and its discontinuation in 1977. With the TI-1270 based on the TMS0974 chips, we consequently differentiate only two different printed circuit boards used with the two different versions of the calculator:

Version PCB
Date codes
Date codes
Display Discrete
TI-1270 V1 Type 2 2476 LTA 1277 LTA TMS0974NL
DIP28 8-digits 1 Jumper Wire
TI-1270 V2 Type 3 1577 LTA 1877 LTA TMS0974NL
SPDIP28 8-digits  

Please notice that the above table lists only TI-1270 calculators manufactured in the Lubbock, Texas facility, both calculators were actually manufactured in Brazil and Italy, too but design changes were typically introduced in the US facilities first.

Preparing our DCM-50A Platform to allow the Characterization of Single-Chip Calculator Circuits of the TMS0970/TMC0900 Family, we studied this TI-1270 calculator manufactured in July 1976 and a WIZ-A-TRON educational toy assembled in June 1978. Learn more about the Bearcat 210 Computer Radio Scanner unleashing the potential of the TMS0970 chip.

Learn more about the different Product Labels used with the TI-1250 - here at the Datamath Calculator Museum we classify the featured TI-1270 as Hardware Version 1, PCB Type 2 and Product Label Style 6.

The TI-1270 was manufactured in Italy for the European market.

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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If you have additions to the above article please email:

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