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An ascii manual page appeared in Version 7
AT&T UNIX.
On older terminals, the underscore code is displayed as a
left arrow, called backarrow, the caret is displayed as an
up-arrow and the vertical bar has a hole in the middle.
Uppercase and lowercase characters differ by just one bit
and the ASCII character 2 differs from the double quote by
just one bit, too. That made it much easier to encode
characters mechanically or with a non-microcontroller-based
electronic keyboard and that pairing was found on old
teletypes.
The ASCII standard was published by the United States of
America Standards Institute (USASI) in 1968.
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