The Aiken code (also known as 2421 code)[1][2] is a complementary binary-coded decimal (BCD) code. A group of four bits is assigned to the decimal digits from 0 to 9 according to the following table. The code was developed by Howard Hathaway Aiken and is still used today in digital clocks, pocket calculators and similar devices[citation needed].
The Aiken code differs from the standard 8421 BCD code in that the Aiken code does not weight the fourth digit as 8 as with the standard BCD code but with 2.
Aiken code (symmetry property)Aiken code in hexadecimal coding
The following weighting is obtained for the Aiken code: 2-4-2-1.
One might think that double codes are possible for a number, for example 1011 and 0101 could represent 5. However, here one makes sure that the digits 0 to 4 are mirror image complementary to the numbers 5 to 9.
Aiken code
Decimal digit
Aiken 2 4 2 1 code[1][2]
0
0 0 0 0
1
0 0 0 1
2
0 0 1 0
3
0 0 1 1
4
0 1 0 0
5
1 0 1 1
6
1 1 0 0
7
1 1 0 1
8
1 1 1 0
9
1 1 1 1
^ abcdefghijkCite error: The named reference Steinbuch_1962 was invoked but never defined (see the help page).
^ abcdefghijkCite error: The named reference Steinbuch-Weber_1974 was invoked but never defined (see the help page).
The Aikencode (also known as 2421 code) is a complementary binary-coded decimal (BCD) code. A group of four bits is assigned to the decimal digits from...
Kansas, once known as Aiken Delta, Utah, originally a railroad switch known as AikenAiken (surname) Aikencode, a complementary BCD code A file format for...
Aiken Lancaster York Chester Newberry Barnwell Bamberg Edgefield 803 area code Tony Santanella (2018-08-10). "Columbia to Get New Telephone Area Code:...
called by various other names, including biphase mark code (CC), F2F (frequency/double frequency), Aiken biphase, and conditioned diphase. Differential Manchester...
rule, the Gray code and the O'Brien code I can be translated into the 8421 pure binary code and the 2421 Aikencode, respectively, to ease arithmetic operations...
Instruments. For decades, Harvard's portion was on display in the lobby of the Aiken Computation Lab. About 1997, it was moved to the Harvard Science Center...
Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local...
season. The second season was won by Ruben Studdard, who defeated Clay Aiken by 134,000 votes out of the 24 million votes recorded. Studdard released...
South Aiken High School is a four-year public high school located in Aiken, South Carolina, United States. Basketball - Girls: 1985, 1988 Golf - Boys:...
Mark II, also known as the Aiken Relay Calculator, was an electromechanical computer built under the direction of Howard Aiken at Harvard University, completed...
the free dictionary. Color Coded Resistance Calculator - University of Pennsylvania Resistor Types – Does It Matter? - Aiken Amps Difference between types...
More Than a Quarter-Billion in Drug Proceeds, Property Forfeited". The Aiken Leader. Archived from the original on 15 June 2012. Retrieved 7 June 2012...
printed with "205," the telephone area code of his hometown of Birmingham. He won the contest over runner-up Clay Aiken by only 134,000 votes out of 24,000...
may refer to: Book of Isaiah, a biblical text Is (novel), a novel by Joan Aiken i"s, a manga by Masakazu Katsura iS (manga), a manga by Chiyo Rokuhana Infinite...
Counties". www.familysearch.org. Retrieved June 8, 2023. Kane, Joseph & Aiken, Charles (2004). The American Counties: Origins of County Names, Dates of...
phase-shift keying Differential Manchester encoding, also known as Aiken biphase or biphase mark code Harvard biphase, used to encode data onto magnetic tape Mu-Tron...
Aiken Air Force Station is a closed United States Air Force General Surveillance Radar station. It is located 6.4 miles (10.3 km) north-northeast of Aiken...
the act were able to remove or weaken several provisions via the Anderson–Aiken amendment and the O'Mahoney jury trial amendment, significantly watering...
website. April 19, 2012. Retrieved January 25, 2013. Kane, Joseph Nathan; Aiken, Charles Curry (2005). The American Counties: Origins of County Names, Dates...
career in 1944 as a member of the Harvard Mark I team, led by Howard H. Aiken. In 1949, she joined the Eckert–Mauchly Computer Corporation and was part...
Global Information
