Hand-held Calculators

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Sperry Remington 661-D & 661

Sperry Remington 661-D in hand
Sperry Remington 661-D

Sperry Remington 661-D

Distinctive features: One of the first of a series of calculators marketed under the Remington name, known for its typewriters and computers.

Technical details:
Display is 6 digits, green fluorescent tubes.


Main integrated circuit - Hitachi HD32154P (date coded 3F 5).

6v (4x AA).

80 mm x 153 mm x 40 mm (3.2" x 6" x 1.6").


Made in Japan.

Although only displaying 6 digits, it calculates to 12 digits. The least significant 6 digits can be transferred to the display by pressing the "Right-arrow" key.

A product announcement for this calculator claimed "Power supply is from four replaceable manganese alkali batteries which will last in continuous use at least 20 hours. A mains adapter is an optional extra." Calculators of this period were power-hungry!

Inside Sperry Remington 661-D
Sperry Remington 661

The 661, on the left, was Sperry Remington's first hand-held calculator, though the 661-D was introduced soon afterwards. The 661 has a different case and keyboard design, but otherwise appears to be very similar, though is much less commonly found.

Sperry and Remington had long and varied histories. Sperry Gyroscope Company was incorporated in 1929, and in 1933 Sperry Corporation was incorporated as a holding company of other small firms, including Sperry Gyroscope, Ford Instrument Company, and Intercontinental Aviation, Inc. In 1955 it acquired Remington Rand, a company which was formed in 1927 by combining Remington Typewriter Company, Rand Kardex Bureau, Inc., the Dalton Adding Machine Company, the Safe Cabinet Company, and the Powers Accounting Machine Corporation. Sperry Gyroscope was interested in Remington Rand because of the UNIVAC, the first commerically available computer, which Remington Rand produced and delivered to the U.S. Census Bureau in 1951. In 1986 Sperry Corporation merged with Burroughs Corporation to form Unisys. (Information from the Burroughs Corporation Collection)

For more information on Sperry-Remington calculators see the article "From ENIAC to Calculator" in the Collecting Calculators section of this site.


There were many calculators which, to save cost, only had a 6-digit display (the Royal Digital III only had a 4-digit display!). Most also had the extra key to reveal the less-significant digits.

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Hand-held Calculators

TI Cal-Tech
Canon Pocketronic
Sanyo ICC-0081 & ICC-82D
Sharp QT-8B
Busicom LE-120A & LE-120S
Sharp EL-8 & Facit 1111
Minolta Minolcom
Brother PRO-CAL 408
Walther ETR3
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Ragen Microelectronic
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Canon LE-10
Rapidman 800
Texas Instruments 2500
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Sinclair Executive
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Olympia CD 81
apf Mark V
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Olivetti Divisumma 18
Iain Jones International Mini A
Hewlett-Packard HP80
Litronix Checkmate
Heathkit IC-2009
MITS 150
Summit Ko9V, K16 & SE88M
Unicom 102
Victor 85 "Tallymate"
Elka 101
RFT minirex 75
Sharp EL-120
Sharp EL-805
Bowmar MX-55
Atlas-Rand, Berkey, & Keystone
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Casio fx-10
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Commodore 776M & 796M
Novus 650 "Mathbox"
Rockwell 8R
General Instrument EZ3000
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Texas Instruments Spirit of '76
Pulsar Calculator Watch
Compuchron Calculator Watch
Adler Lady & Sir
Elektronika B3-18A & C3-15
Commodore S61
"Standard Type 1"
Sharp EL-8026
Texas Instruments TI-30
Canon Multi 8
Casio ST1
Wrist Calculators
Kosmos I & Kosmos Astro
Hanimex Calculator-Recorder
Navigation Calculators
TI58 Special Function Calculators
Sandvik 842S Coromant
"Standard Type 2"
Panasonic Electronic Ruler
Teal Photon
Casio Mini Card LC-78
Feet & inches calculators
SCAT Specialist Calculators
Sharp EL-826
Sharp EL-825
Sanyo CX-1
Elektronika MK-33 etc
Sharp PC1211/Tandy TRS80 PC1
Slide Rule
Otis King L

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2015 except where noted otherwise.