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Texas Instruments MBA Handheld Electronic Calculator

Texas Instruments MBA Handheld Electronic Calculator

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Advertised as a “powerhouse of financial and statistical problem solving,” this handheld financial calculator has a black plastic case and forty small rectangular plastic keys arranged in eight rows. In addition to ten digit keys, a decimal point key, and a change sign key (all off-white), the calculator has a total key and four arithmetic function keys (all gold). The remaining keys are brown. Pushing the “2nd” key allows keys to serve a “dual function,” which is denoted by text above the keys. The calculator provides a wide variety of statistical and accounting functions. It includes thirty-two step programming.
A mark at the top of the keyboard reads: The MBA. Text behind the display reads: TEXAS INSTRUMENTS. Next to this is an on/off switch. Behind this is an eight-digit LED display.
A jack for a power supply is along the right edge.
Text on the back of the calculator reads in part: TEXAS INSTRUMENTS (/) electronic calculator (/) SERIAL NO. (/) 324706. It has the date mark: ATA3578. It also reads in part: ASSEMBLED IN USA. Below the marks is a compartment that holds a battery pack. Text on it reads: TEXAS INSTRUMENTS BATTERY PACK BP-7. There are no screws on the back of the case and the chips are not visible.
The calculator has a black zippered plastic case with a carrying loop.
Compare 1986.0988.050 (the TI-55 scientific calculator).
[Advertisement], Boston Globe, November 6, 1977, p. 75. TI MBA selling for $64.95.
[Advertisement], Los Angeles Times, May 20, 1978, p. D4. TI MBA selling for $63.00.
[Advertisement], Washington Post, May 22, 1979, p. B3. Advertising copy quoted from here. Calculator advertised as selling for $57.95.
[Advertisement], Los Angeles Times, November 30, 1980, p. H2. MBA selling for $59.95.
[Advertisement], New York Times, January 30, 1983, p. H31. MBA price $49.50.
Currently not on view
Object Name
electronic calculator
date made
Texas Instruments
Physical Description
plastic (case; keys; carrying case material)
metal (keyboard; circuitry; zipper material)
overall: 1 3/8 in x 3 in x 5 3/4 in; 3.4925 cm x 7.62 cm x 14.605 cm
ID Number
accession number
catalog number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History
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I hold a TI "MBA" calculator, with original case, identical to the one described except my serial # is 177481 and the "date stamp" is ATA3278 (USA assembled on week 32 of 1978). The proprietary power cord is missing, as is the 109-page owner's manual (avail in pdf format at Assuming its "BP7" battery pack can still hold a charge, the device appears fully functional.
I had one; maybe still have it stored away somewhere. Bought it around 1980 while I was in MBA program. There was an instruction booklet that was the same size as the calculator; maybe 30 or 40 pages. Calculator was very powerful. I can't remember how you programmed it; but do recall you could program a series of several operations.

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