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: 2.5 MByte)

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.

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.