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The handbook was originally published in 1928 by the Chemical Rubber Company (now CRC Press) as a supplement (Mathematical Tables) to the CRC Handbook of Chemistry and Physics. Beginning with the 10th edition (1956), it was published as CRC Standard Mathematical Tables and kept this title up to the 29th edition (1991).
Code fragment 2: Polynomial division with deferred message XORing. This is the standard bit-at-a-time hardware CRC implementation, and is well worthy of study; once you understand why this computes exactly the same result as the first version, the remaining optimizations are quite straightforward.
CRC (numeric: 188) Subunit: 0.01: Unit; Plural: colones: Symbol ₡ Denominations; Subunit 1 ⁄ 100: céntimo (out of circulation) Banknotes Freq. used ₡1 000, ₡2 000, ₡5 000, ₡10 000, ₡20 000 Rarely used ₡50 000 (Withdrawn, still exchangeable at Banco de Costa Rica) Coins Freq. used ₡10, ₡25, ₡50, ₡100, ₡500 Rarely used
50 Colones D 18 March 1980 #14 Rigoberto Navarro Meléndez [7] [8] 50 Colones D 2 April 1981 #21 Rigoberto Navarro Meléndez [7] [8] 50 Colones D 18 May 1982 #1 Carlos Manuel Castillo Morales Rigoberto Navarro Meléndez [7] [8] 50 Colones D 28 August 1984 #4 Marco Antonio López Agüero Olivier Castro Pérez [7] [8] 50 Colones D 22 November 1984 #2
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20 Colones Venus de Milo (Universal Art) .999 Silver 43.12g 7,500 proof [2] 25 Colones 25 years of social legislation .999 Silver 53.9g 6,800 proof 50 Colones Human Rights .900 gold and .100 copper 7.45g 3,507 proof 100 Colones Native American Gold Art .900 gold and .100 copper 14.9g 3,507 proof 200 Colones Juan Santamaria, National Hero of 1856
the Costa Rican colón (CRC), used in Costa Rica since 1896 the Salvadoran colón (SVC), used in El Salvador from 1892 until 2001, when it was replaced by the American dollar Symbol
To compute an n-bit binary CRC, line the bits representing the input in a row, and position the (n + 1)-bit pattern representing the CRC's divisor (called a "polynomial") underneath the left end of the row. In this example, we shall encode 14 bits of message with a 3-bit CRC, with a polynomial x 3 + x + 1.