"C" CRT terminal | C mode accepts all eight bit characters as data, except for the following six: ASCII 3, 8, 10, 13, 21, and 127. The ASCII 127 Delete character echoes as a destructive backspace, that is, it backspaces and erases the preceding character. ASCII 21 (Ctrl-U) echoes enough destructive backspaces to bring the cursor to the start of the READ. If the setting for the right margin, or the nature of the terminal, forces echoed characters to begin a new line, Ctrl-U can erase only the characters on the last physical line. In any case, Ctrl-U cancels all input since the start of the READ. C is mutually exclusive with the P protocol. |
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