Texas Instruments TI-2500-II / Datamath II

Date of introduction:  November 11, 1974 Display technology:  LED-stick
New price:  $49.95, DM 148.00 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:  2500-II-256861
Batteries:  2*AA NiCd Date of manufacture:  wk 32 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)

TI-2500-II_PCB2.jpg (51329 Byte)The Datamath II alias TI-2500-II is a quite funny calculator. It uses the modern electronics of the stylish TI-1500 calculator in the old-fashioned Datamath housing. It was introduced late and never a big success.

The main difference to the other Datamath calculators is the added [%] key and the usage of only 2 rechargeable NiCd batteries. Take a look on the Version 1 of the Datamath!

A more detailed comparison between the ten known Datamath Versions could be found here.

The Datamath II seems to be together with the TI-150 the last TI calculator using the standard Klixon™ keyboard technology.

In Spain this calculator was labeled TI-2500 II without the dash at the series II designation.

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.

The TI-2500-II is featured in the Texas Instruments Deutschland GmbH leaflet ER-1975 dated 1975.

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© Joerg Woerner, December 5, 2001. No reprints without written permission.