Unisonic 1299R-A Handheld Electronic Calculator
date: label: date made
content: ca 1975
name: label: maker
content: Unisonic
notes: label: Description
content: This handheld electronic scientific calculator has a metal and plastic case and an array of thirty-seven rectangular plastic keys. In addition to ten digit keys and a decimal point key, it has keys for trigonometric and inverse trigonometric functions, pi, logarithms, natural logarithms, exponents, powers of ten, general powers, inverses, squares, square roots, arithmetic functions, change sign, exchange, parentheses, and memory. Pushing an INV key at the top left allows some keys to perform a second function. Switches for radians/degrees/grad and for on/off are left of the INV key at the top of the keyboard. A mark above this reads: Unisonic 1299R. A green vacuum fluorescent display is behind this. It shows an eight-digit mantissa and a two-digit exponent, with signs for both.
label: Description
content: A power jack is on the top edge.
label: Description
content: The back of the calculator has a sticker describing calculation examples. It reads in part: 1299R-A. It also reads in part: SERIAL NO. (/) 032370 (/) MADE IN JAPAN. Below this is a compartment for four AA batteries.
label: Description
content: The black plastic sleeve holds not only the calculator but a pamphlet with title <I>Unisonic 1299R 8-Digit Scientific Slide Rule Calculator Instruction Manual</I>. It describes the function of the keys in detail.
label: Description
content: The case of this calculator is similar in style to 1986.0988.117 (Unisonic 790R-C), 1986.0988.118 (Unisonic 790RM-C), 1986.0988.116 (Unisonic 796-A), and 1986.0988.115 (Unisonic 799-A), which is used as the basis for a rough date of 1975. No advertisements found.
label: Location
content: Currently not on view
place: label: place made
content: Japan
setName: label: See more items in
content: Medicine and Science: Computers
label: See more items in
content: Computers & Business Machines
label: See more items in
content: Handheld Electronic Calculators
creditLine: label: Credit Line
content: Gift of John B. Priser
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.0988.112
label: accession number
content: 1986.0988
label: catalog number
content: 1986.0988.112
objectType: label: Object Name
content: electronic calculator
label: Other Terms
content: electronic calculator; Handheld
physicalDescription: label: Physical Description
content: plastic (case; keys; carrying sleeve material)
label: Physical Description
content: metal (case; circuitry material)
label: Physical Description
content: glass (display material)
label: Physical Description
content: paper (sticker; instructions material)
label: Measurements
content: overall: 1 3/8 in x 3 1/2 in x 6 in; 3.4925 cm x 8.89 cm x 15.24 cm