Texas Instruments TI-2500 II / Datamath II (Made in Spain)

Date of introduction:  November 11, 1974 Display technology:  LED-stick
New price:  $49.95 Display size:  8
Size:  5.5" x 3.0" x 1.7"
 139 x 76 x 42 mm3
Weight:  6.7 ounces, 191 grams Serial No:  N 00446
Batteries:  2*AA NiCd Date of manufacture:  wk 25 year 1975
AC-Adapter:  AC9130 Origin of manufacture:  USA
Precision:   Integrated circuits:  TMS0803
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 2.5M Bytes)

This Datamath II alias TI-2500 II was manufactured in Spain. Main differences are the changed label on the backside of the calculator and the different designation without the dash. Don't miss the US-built TI-2500-II (yes, with a dash between TI-2500 and II). 

The Datamath II seems to be the last TI calculator using the standard Klixon™ keyboard technology.

Recently fellow collector Dave Wilson reported an European TI-2500-II (with the dash) manufactured in Italy late in 1975.

Ken Shirriff studied the United States Patent Application US3934233A describing the TMS0800 architecture and the program code used with the TI-1500 very carefully and was able to create a JavaScript Simulator for the TMS0800 simulating a (slightly modified) TI-2500-II.

Datamath™ and Klixon™ are trademarks of Texas Instruments.

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© Joerg Woerner, September 20, 2003. No reprints without written permission.