What is the ASCII code?
Characters, i.e. letters, digits or special characters, can be represented in binary with the ASCII-Code . For this purpose, each character is assigned a specific bit. For this purpose, a certain bit pattern is assigned to each character. For example, the bit pattern for the letter “A” in the extended ASCII-Code corresponds to “01000001”. If the bit patterns of individual characters are strung together, entire texts can be coded in binary. In its original version, the code had a length of 7 bits. With 7 bits, a total of 2^7 = 128 different characters can be represented. The code was defined by American National Standards Institute (ANSI).
How is the ASCII-Code entered?
Binary coded characters can be entered via a computer keyboard. In ASCII tables the different digit sequences are indicated. The entry must be made using the numeric keypad while holding down the Alt key. For example, the digit sequence for the “@” is 64.
In the original code, no coding is provided for language-specific special characters, for example for the umlauts ä, ö or ü in the German language. By extending the originally only 7-bit long code to 8 bits, up to 256 can be represented today. The first 128 characters always correspond to the original code. Only the remaining 128 characters differ depending on the ANSI coding.
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