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Home > EBCDIC

Single byte EBCDIC takes up eight bits, which are divided in two pieces. The first four bits are called the zone and represent the category of the character, whereas the last four bits are the called the digit and identify the specific character. There are a number of different versions of EBCDIC, customised for different countries.

Some East Asian countries use a double byte extension of EBCDIC to allow display of Chinese, Japanese and Korean scripts for their mainframes. In the double byte extentension of EBCDIC, there are shift codes [0x0E,0x0F] to shift between the single byte and double byte modes.

IBM typically names all of its codepages with a number called a CCSID (Coded Character Set IDentifier). It is important to note that the same CCSID can have different character positions in a codepage. For example, the newline character can be a different byte value in os/390 open edition versus the other EBCDIC based operating systems. This becomes an issue when transferring EBCDIC based text data between machines.

1 History

EBCDIC was devised in the 1963- 1964 timeframe by IBM and was announced with the release of the IBM System/360The IBM System/360 S/360 is a computer system family announced by International Business Machines on April 7 1964. It was the first family of computers making a clear distinction between architecture and implementation. The chief architect of the S/360 wa line of mainframe computertower of a personal computer. A computer is a device for making calculations or controlling operations that are expressible in numerical or logical terms. While factually accurate, this definition and those found in other dictionaries are so broad that ths at the apex of IBM’s mainframe monopolyAlternate use: Monopoly (game In economics, a monopoly (from the Greek monos one + polein to sell) is defined as a market situation where there is only one provider of a product or service. Monopolies are characterized by a lack of economic competition fo. It was created to extend the Binary Coded Decimal that existed at the time. EBCDIC was the predecessor to ASCII, which was devised in 1968. EBCDIC is an 8 bit encoding, vs. the 7 bit encoding of ASCII. Many extensions to ASCII had been devised before Unicode became a standard.

There is a nice correspondence between hexadecimal character codes and punch card codes for EBCDIC — an important feature at the time. Unfortunately the Roman alphabet characters are numerically non-contiguous, which is a great annoyance for many of the more modern programming languages. It is more difficult to sort or select a range of characters in EBCDIC compared to ASCII (for example, sorting the range of characters [a-z] when accented characters are involved).

All IBM mainframe peripherals and operating systems used EBCDIC. Their only lip service to ASCII was to provide an ASCII mode for reading magnetic tapes. Some mainframe applications can support Unicode, but it is not nearly as good as it could be.

There is an EBCDIC Unicode Transformation Format proposed by the Unicode consortium, but it is not intended to be used in open interchange environments.

2 Codepage layout

This is CCSID 500, a variant of EBCDIC. Characters 0x00–0x3F and 0xFF are controls, 0x40 is space, 0x41 is no-break space, 0xCA is soft hyphen.

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Topics: EBCDIC Ebcdic Character Byte Ascii Unicode Ibm Characters...

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EBCDICEBCDIC (Fully, "Extended Binary Coded Decimal Interchange Code") is an 8- bit character encoding used on IBM mainframes and AS/400s. It is descended from punched cards and the corresponding six bit binary-coded decimal code that most of IBM's computer per