Digital Electronics
ASCII

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

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Digital Electronics
2421 code is

 weighted non-self-complementing code
 non-weighted self-complementing code
 non-weighted and non-self-complementing code
 weighted self-complementing code

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