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Datamath History

Collecting calculators, you'll sooner or later recognize different versions of the famous Texas Instruments Datamath (TI-2500). Digging deeper into the mechanical and electrical  engineering of this calculator, we can define a total of seven different US-built versions:

• TI-2500 First Series
• TI-2500 Version 1
• TI-2500 Version 2
• TI-2500 Version 3 (Same as TI-2500-B)
• TI-2500B
• TI-2510
• TI-2500-II

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

• TI-2500B (Spain)
• TI-2511

Most of the known Datamath models were sold under the "Longines Symphonette" brand, too. These calculators can easily identify due to their olive green housing. Find an example here.

Finally don't neglect the Pre-Series of the Datamath and the Minimath Prototype sporting a white housing.

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 Tan, Molded CE/D key 6 NiCd soldered 2 screws 16h 2 LED modules 30356 TMS0119
TI-2500 Version 2 Feb.1973 Tan, Molded CE key 4 NiCd soldered no 10h 2 LED modules 30319 30367 TMS0119
TI-2500 Version 3 Aug.1973 Tan, Decal CE key 3 NiCd or 4 AA-cell yes 10h 1 LED PCB 30684 TMS0119
TI-2500B Jan.1974 Tan, Decal CE key 3 NiCd or 4 AA-cell yes 10h 1 LED PCB 30684 TMS0119
TI-2500B
Spain
1974 Tan, Decal CE key 3 NiCd yes 10h 1 LED PCB 30684 TMS0119
TI-2510
(Version 3)
Oct.1973  Ivory, Decal CE key 4 AA-cell yes n.a. 1 LED PCB 30614 TMS0119
TI-2510
(Version B)
Jan.1974 Ivory, Decal CE key 4 AA-cell yes n.a. 1 LED PCB 30684 TMS0119
TI-2511 1974 Tan, Decal CE key 4 AA-cell yes n.a. 1 LED PCB 30684 TMS0119
TI-2500-II Nov.1974 Tan, Decal % 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.