Write the following abbreviations in full. (3mks)
Binary Coded Decimal code(BCD)
Binary coded decimal (BCD) is a system of writing numerals that assigns a four-digit binary code to each digit 0 through 9 in a decimal (base-10) numeral. The four-bit BCD code for any particular single base-10 digit is its representation in binary notation, as follows: 0 = 0000. 1 = 0001.
Where is BCD used?
BCD was used in many early decimal computers, and is implemented in the instruction set of machines such as the IBM System/360 series and its descendants, Digital Equipment Corporation's VAX, the Burroughs B1700, and the Motorola 68000-series processors.
American Standard Code for Information Interchange Code (ASCII)
ASCII is a 7-bit character set containing 128 characters. It contains the numbers from 0-9, the upper and lower case English letters from A to Z, and some special characters. The character sets used in modern computers, in HTML, and on the Internet, are all based on ASCII.
Why is ASCII 7 bit?
ASCII a 7-bit are synonymous, since the 8-bit byte is the common storage element, ASCII leaves room for 128 additional characters which are used for foreign languages and other symbols. ... This mean that the 8-bit has been converted to a 7-bit characters, which adds extra bytes to encode them.
How many characters can ASCII represent?
ASCII uses 8 bits to represent a character. However, one of the bits is a parity bit. This is used to perform a parity check (a form of error checking). This uses up one bit, so ASCII represents 128 characters (the equivalent of 7 bits) with 8 bits rather than 256.
Extended Binary Coded Decimal Interchange Code (EBCDIC)
It is a single byte (8 bit) character encoding standard that is used in the IBM mainframe environment. IBM didn't invent just one version of EBCDIC either but several different incompatible versions.
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