DATAMATH CALCULATOR MUSEUM |
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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 22, 2000. No reprints without written permission.