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RFC 3629:UTF-8, a transformation format of ISO 106...
RFC-Ref

US-ASCII


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... uses all bits of an octet, but has the quality of preserving the full US-ASCII [US-ASCII] range: US-ASCII ...
... US-ASCII [US-ASCII] range: US-ASCII characters are encoded in one octet having the normal US-ASCII value, and any octet with such a ...
... range: US-ASCII characters are encoded in one octet having the normal US-ASCII value, and any octet with such a value can only stand for a US-ASCII character, and nothing else. ...
... octet having the normal US-ASCII value, and any octet with such a value can only stand for a US-ASCII character, and nothing else. UTF-8 ...
... hexadecimal): o Character numbers from U+0000 to U+007F (US-ASCII repertoire) correspond to octets 00 to 7F (7 bit US-ASCII ...
... US-ASCII repertoire) correspond to octets 00 to 7F (7 bit US-ASCII values). A direct consequence is that a plain ASCII string is also a valid ...
... UTF-8 string. o US-ASCII octet values do not appear otherwise in a UTF-8 encoded ...
... file systems or other software (e.g., the printf() function in C libraries) that parse based on US-ASCII values but are transparent to other values. ...



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