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Datamath History

Collecting calculators you'll sooner or later recognize different versions of the famous Texas Instruments Datamath calculator. Digging deeper into the mechanical and electronic  engineering of that calculator we can define a total of 7 different US-built versions:

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TI-2500 First Series

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TI-2500 Version 1

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TI-2500 Version 2

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TI-2500 Version 3 (Same as TI-2500-B)

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TI-2500B

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TI-2510

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TI-2500-II

Beside these 7 basic versions you can find small variations in labeling or country of origin. 

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TI-2500B (Spain)

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TI-2511

Most of the known Datamath models were sold under the "Longines Symphonette" brand, too. These one you can easily identify due to their green housing. Find a picture here.

Finally don't forget the white preseries of the Datamath and the LCD prototypes Minimath.

Datamath Comparision

Type Introduction Color, Label Keyboard Batteries Battery Access Charging time Display PCB Circuits
TI-2500 
First Series
Jun.1972 White, Molded CE/D key 6 NiCd soldered 2 screws 16h 2 LED modules 30356 TMS0110
TI-2500 Version 1 Sep.1972 Creme, Molded CE/D key 6 NiCd soldered 2 screws 16h 2 LED modules 30356 TMS0119
TI-2500 Version 2 Feb.1973 Creme, Molded CE key 4 NiCd soldered no 10h 2 LED modules 30319 30367 TMS0119
TI-2500 Version 3 Aug.1973 Creme, Sticker CE key 3 NiCd or 4 AA-cell yes 10h 1 LED PCB 30684 TMS0119
TI-2500B Jan.1974 Creme, Sticker CE key 3 NiCd or 4 AA-cell yes 10h 1 LED PCB 30684 TMS0119
TI-2500B
Spain
1974 Creme, Sticker CE key 3 NiCd yes 10h 1 LED PCB 30684 TMS0119
TI-2510
(Version 3)
Oct.1973  Ivory, Sticker CE key 4 AA-cell yes n.a. 1 LED PCB 30614 TMS0119
TI-2510
(Version B)
Jan.1974 Ivory, Sticker CE key 4 AA-cell yes n.a. 1 LED PCB 30684 TMS0119
TI-2511 1974 Creme, Sticker CE key 4 AA-cell yes n.a. 1 LED PCB 30684 TMS0119
TI-2500-II Nov.1974 Creme, Sticker % key 2 NiCd or 2 AA-cell yes 12h 1 LED PCB 101652 TMS0803

 Datamath™ is a trademark of Texas Instruments.

 

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If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner December 22, 2000. No reprints without written permission.

 

 


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