![]() ![]() ![]() IBM includes support for this code page in the hardware of its model 5150, known as "IBM-PC", considered the first personal computer. In this way was added the ASCII characters ranging from 128 to 255. Also 128 characters were added, with new symbols, signs, graphics and latin letters, all punctuation signs and characters needed to write texts in other languages, such as Spanish. ![]() In 1981, IBM developed an extension of 8-bit ASCII code, called "code page 437", in this version were replaced some obsolete control characters for graphic characters. So with this set of only 128 characters was published in 1967 as standard, containing all you need to write in English language. This code arises from reorder and expand the set of symbols and characters already used in telegraphy at that time by the Bell company.Īt first only included capital letters and numbers, but in 1967 was added the lowercase letters and some control characters, forming what is known as US-ASCII, ie the characters 0 through 127. However, due to the lack of standardization among extended ASCII character sets, compatibility issues may arise when transferring data between systems that use different character sets.The American Standard Code for Information Interchange, or ASCII code, was created in 1963 by the "American Standards Association" Committee or "ASA", the agency changed its name in 1969 by "American National Standards Institute" or "ANSI" as it is known since. In the case of an extended ASCII character like ' Ñ' in the ISO-8859-1 character set, it has a decimal value of 209, which corresponds to the 8-bit binary code 11010001.When processing or transmitting text data, computer systems and communication protocols use these byte representations of ASCII and extended ASCII characters to encode, store, and transfer information. When storing this character in memory, the binary code is placed in an 8-bit byte with the MSB set to 0: 01000001. ![]() The 8-bit representation allows for the full range of 256 characters, including both the original ASCII characters (0 to 127) and the extended characters (128 to 255).įor example, the letter ' A' has an ASCII value of 65, which corresponds to the 7-bit binary code 1000001. When storing extended ASCII characters in memory, each character is represented by an 8-bit byte, just like the original ASCII characters. When storing an ASCII character in memory, the 7-bit binary code is placed in a byte with the most significant bit (MSB) set to 0, effectively making it an 8-bit value.Įxtended ASCII character sets, such as ISO-8859-1 (Latin-1) or Windows-1252 (CP1252), use the full capacity of an 8-bit byte to represent 256 unique characters instead of just 128. Each ASCII character has a unique 7-bit binary code, with values ranging from 0000000 (0 in decimal) to 1111111 (127 in decimal). ASCII characters, including those from the extended ASCII character sets, are stored in memory as 8-bit bytes. ![]()
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