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D-2
Character Sets
To enter a control character from the keyboard, first find the displayable character
equivalent by adding 64 to the decimal value of the control character in the relevant
character set table. For example, the control character CR (carriage return) has a
decimal value of 13. Adding 64 makes 77 which is the decimal value of the
displayable character M. When the Ctrl (control) key is held down and Shift + M is
pressed (or M alone if Caps Lock is on), this will generate a CR code in local mode.
Some setup options require you to specify one or more control characters. A control
character can be specified by typing ^ to represent the Ctrl key, immediately
followed by the displayable character equivalent of the control character as described
in the previous paragraph. For example, ^M, represents Ctrl + M, which generates
the control character CR.
Another way of specifying control characters is by entering the decimal value of the
ASCII character. Decimal values are entered as three-digit numbers immediately
preceded by an underscore character. Values with only two digits must be preceded
by a zero. For example, the decimal value of CR is 13, so this would be entered as
_013.