As character names:

U+0100 LATIN CAPITAL LETTER A WITH MACRON character (Ā)

As raw characters:

Ā

As a string of HTML entities:

Ā

Decoder output:

Byte number 1 is decimal 196, hex 0xC4, octal \304, binary 11000100
This is the first byte of a 2 byte sequence.

Byte number 2 is decimal 128, hex 0x80, octal \200, binary 10000000
This is continuation byte 1, expecting 0 more.

U+0100	LATIN CAPITAL LETTER A WITH MACRON
	: 0041 0304