overall: 9 cm x 18.5 cm x 18.5 cm; 3 17/32 in x 7 9/32 in x 7 9/32 in
Japan: Ōsaka, Ōsaka
This compact Japanese electronic calculator straddles the border between desktop and pocket calculators. It is too large to fit in the pocket but considerably more compact than Sharp’s QT-8B. It does not require a cradle to recharge batteries.
The calculator has an array of nine digit keys, with larger 0 and decimal point keys below. Right of these are a clear key, a key for indicating that multiplication (rather than addition) should be carried out, a key for indication that division (rather than subtraction) should be carried out, and a key for multiplication or division. The machine has an eight digit capacity for all operations. In back of the keyboard is an eight digit display. Above these are alarm and error indicators. A switch is on the side shifts between AC operation, off, and DC operation.
A mark on the front reads: SHARP. A tag on the back reads in part: SHARP MODEL EL-8. It also reads: NO. 006927Y (/) SHARP ELECTRONICS CORPORATION (/) 10 KEYSTONE PLACE, PARAMUS (/) NEW JERSEY 07652 MADE IN JAPAN. An AC adapter comes with the device and is included in the dimensions.
Inside the case are six nickel-cadmium batteries in a case, a calculator circuit board, a display circuit board, and eight tubes for the display. The four integrated circuits on the calculator board were made by North American Rockwell.
The battery case is marked in part: SHARP MODEL EL-84 (/) NICKEL-CADMIUM (/) RECHARGEABLE BATTERY. It also is marked: SHARP CORPORATION OSAKA, JAPAN. Hayakawa Electric adopted the name Sharp Corporation in January of 1970.
The SHARP EL-8 was widely advertised in the United States from early 1971 and sold for $345. This example came to the Museum in 1982.
Compare a slightly earlier Sharp machine, the model QT-8B (2006.0132.22). Also compare three versions of the EL-8 (1982.0656.01, 1981.0922.05, and 1991.0154.01).
Examples of the Sharp EL-8 are discussed online at the Vintage Calculators Web Museum, The Old Calculators Web Museum, John Wolff’s Web Museum and the Datamath Calculator Museum.
Guy Ball and Bruce Flamm, <I>The Complete Collector’s Guide to Pocket Calculators</I>, Tustin, Calif.: Wilson/Barnett Publishing, 1997, pp. 136–137.
J. R. Free, "Microelectronics Shrinks the Calculator," <I>Popular Science</I>, 198 #6, June 1971, pp. 74–76.
“How to Cut a Pocket Calculator in Half,” <I>Electronics</I>, 44. February 1, 1971, no page. An ad for the EL-8 (called the ELSI-8) appeared on pp. 12–13 of this issue.