Digital Electronics
The code used in digital systems to represent decimal digits, letters, and other special characters such as + , – , . , * , etc. is

 octal
 hexadecimal
 ASCII
 natural BCD

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Digital Electronics
ASCII

 is version II of the ASC standard
 is a subset of 8-bit EBCDIC
 is used only in western countries
 has 128 characters including control characters

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