Casio Memory-8R Handheld Electronic Calculator - Model Y-811

Casio Memory-8R Handheld Electronic Calculator - Model Y-811

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Usage conditions apply
This handheld electronic calculator represents a further improvement on Casio's early handheld calculators. As on the Casio Mini, the display is to the left of the keyboard. The keyboard has an array of ten digit keys, a decimal point key, a total key, and four keys for arithmetic functions that are to the right of the digit keys. Left of the digit keys is a column with a memory key, a percentage key, a C (clear entry) key, and an AC (all clear) key.
The on/off switch is below the eight-digit fluorescent display. A mark below this switch reads: CASIO memory-8R. A socket for a power adapter is at the top.
A mark on the back of the calculator reads: CASIO memory-8R (/) BATTERY SUPPLY 1.5Vx2 (/) or use AC ADAPTOR AD-2S (/) 0.2W (/) Y-811 MADE IN JAPAN (/) BM CASIO COMPUTER CO., LTD. A compartment that holds two batteries is above this. A sticker inside the compartment reads: 4504646.
This example has a black plastic sleeve that served as a carrying case. A mark on it reads: MADE IN JAPAN. A mark on the other side reads: CASIO.
An October 1975 advertisement for several Casio calculators with memory asked: “When you’ve got a Casio Memory, who needs an elephant?" It indicated that the suggested retail price of this model was then $14.85. Further advertisements appeared in 1976.
Chicago Tribune, October 21, 1975, p. B3.
Chicago Tribune January 8, 1976, p. C6.
Los Angeles Times, July 30, 1976, p. E8.
Vintage Technology website.
Currently not on view
Object Name
electronic calculator
date made
Casio Computer Company
place made
Physical Description
plastic (case; display cover; carrying case; keys material)
metal (trim; circuitry material)
paper (sticker material)
overall: 3/4 in x 5 3/4 in x 2 3/4 in; 1.905 cm x 14.605 cm x 6.985 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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My husband gave it to me in 1978 as a birthday gift. Used it all the time. It has finally stopped working. I will miss it
I have had a CASIO memory-8R for over 40 years. On all my fingers and toes I cannot count the number of calculators (battery and AC powered), cell phones and laptops that I have burned through, yet the 8R keeps on keepin' on. I use it every day, bulletproof technology from a time when quality was important. Today? Well, it's all about gaming, apps, social media, WI-FI hot spots, Snapchat, Twitter and the like. The downside of this calculator and all others is that there is a generation out there that can't work a basic math problem with a pencil and paper.
I have one too (it was my Mom's). Still works great!

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