Texas Instruments TI-2500 II (Datamath II) Handheld Electronic Calculator
date: label: date made
content: 1974-1975
name: label: maker
content: Texas Instruments
notes: label: Description
content: This is an example of an early handheld electronic calculator marketed by Texas Instruments under its own name. The calculator has a tan plastic case with a dark brown keyboard. It has an array of nineteen keys, seventeen of them square and two rectangular. These include ten digit keys, a decimal point key, a total key, four arithmetic function keys, a clear key, a clear entry key, and a percentage key. The percentage key distinguishes it from the TI-2500B.
label: Description
content: A mark above keyboard on the right reads: Datamath II. Behind the keyboard is an eight-digit LED display.
label: Description
content: A jack for a power adapter is along the back edge. An on/off switch is on the left side.
label: Description
content: The back of the calculator has a compartment for storing either two rechargeable nickel-cadmium batteries or two AA-sized non-rechargeable batteries.
label: Description
content: A sticker on the compartment cover reads: TI-2500II electronic calculator (/) Texas Instruments Incorporated (/) P.O. Box 22288: Dallas, Texas 75222. It also reads in part: Serial Number (/) 2500II- 019756. The sticker indicates that the calculator should be recharged for twelve hours using an AC9130 adapter/charger.
label: Description
content: Unscrewing three long screws on the back of the case does not reveal the chips.
label: Description
content: This modification of the TI-2500 was introduced in 1974 and sold at least until 1975.
label: Description
content: Compare 1986.0988.188, 1986.0988.189, 1986.0988.190, 1986.0988.342, and 1986.0988.359.
label: Description
content: References:
label: Description
content: Guy Ball and Bruce Flamm, <I>The Complete Collector’s Guide to Pocket Calculators</I>, Tustin, CA: Wilson/Barnett, 1997, p. 157.
label: Description
content: Online Datamath Museum, accessed May 13, 2015.
label: Description
content: [Advertisement], <I>Chicago Tribune</I>, March 2, 1975, p. G27. Price given as $49.95.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Computers
label: See more items in
content: Computers & Business Machines
label: See more items in
content: Handheld Electronic Calculators
creditLine: label: Credit Line
content: Gift of John B. Priser
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.0988.342
label: catalog number
content: 1986.0988.342
label: accession number
content: 1986.0988
objectType: label: Object Name
content: electronic calculator
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: 1 5/8 in x 3 7/8 in x 5 1/2 in; 4.1275 cm x 9.8425 cm x 13.97 cm