Casio Mini Card LC-78 Handheld Electronic Calculator

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This credit card-sized, lightweight handheld electronic calculator has an aluminum case, plastic keys and display cover, a plastic circuit board, and various metal circuitry. In addition to an array of ten digit keys, a decimal point key, and a total key, it has a column of four arithmetic function keys immediately to the right of the digit keys, and a column with a percentage key and three memory keys on the far right. The on/off switch is above the keyboard and the AC (all clear) and clear keys are left of the digit keys. The eight-digit liquid crystal display is above and to the left of the keyboard. A mark below it reads: CASIO- MINI CARD (/) ELECTRONIC CALCULATOR (/) LC-78. A mark on the back reads: CASIO-MINI CARD (/) BM 1.5V x 2 (DC) 0.0006W (/) CASIO COMPUTER CO., LTD. (/) LC-78 MADE IN JAPAN.
A screw on the right side of the back holds it to the front. Unscrewing it reveals the circuitry and a space for two squat cylindrical batteries. A sticker on the inside of the back of the case reads: 4595189. A mark on the chip reads: B6.
According to an October, 1978, advertisement in the Los Angeles Times, the Casio LC78 was regularly priced at $29.99 and then on sale for $26.99. A December, 1978, advertisement in the same newspaper is entitled “For someone you love who loves being accurate: the math machines.” It describes several calculators, including the LC78. It gives a price of $29.99. By June 1980, the Washington Post lists a sale price for the Mini Card of $14.99.
Los Angeles Times, October 18, 1978, p. F12.
Los Angeles Times, December 10, 1978, p. A26.
Washington Post, June 13, 1980, p. A29.
Currently not on view
date made
Casio Computer Company
place made
Physical Description
aluminum (case material)
plastic (keys; circuit board; display window material)
paper (sticker material)
overall: 3/16 in x 2 1/8 in x 3 1/2 in; .4572 cm x 5.3975 cm x 8.89 cm
ID Number
catalog number
accession 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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