Casio LC-785 Handheld Electronic Calculator

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This credit card-sized, lightweight handheld electronic calculator has an aluminum case and brown plastic keys. 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 square root, C (clear), and AC (all clear) keys are left of the digit keys. The on/off switch is next to the AC key.
The eight-digit liquid crystal display is above and to the left of the keyboard. A mark below it reads: CASIO LC-785 (/) ELECTRONIC CALCULATOR. A mark on the back reads: CASIO LC-785B (/) BM MADE IN JAPAN RATING: DC 3V 0.00025W (/) USE BATTERY 1.5Vx2.
A screw on the left side of the back holds it to the front. Unscrewing it reveals the circuitry. A sticker on the inside of the back of the case reads: 1D202A.
The calculator fits in a leather pouch which also has a booklet of instructions printed in English, German, French, Spanish and Italian. A mark on the pouch reads: CASIO.
Several advertisements for the LC-785 appeared in late 1981. None found specifically mentions the LC-785B. The Casio website lists the LC-785 as a product of Casio in 1982.
Washington Post, October 23, 1981, p. B10. This gives a regular price of $13.95 and a sale price of $11.95.
Los Angeles Times, October 31, 1981, p. D3. This gives a regular price of $12.95.
Los Angeles Times, November 29, 1981, p. G26. This gives a regular price of $16.99 and a sale price of $10.99.
Casio website .
Currently not on view
date made
Casio Computer Company
place made
Physical Description
metal (case; circuitry material)
plastic (keys; circuit board material)
paper (sticker material)
overall: 1/8 in x 3 1/2 in x 2 1/2 in; .3175 cm x 8.89 cm x 6.35 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


I have a Casio LC-785 bought in the UK 1982 same batteries, and it still works... Anything made in Japan is fantastic!!..
"I bought one in Singapore 1981, still have it, still use it, have not changed the battery!"

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