On teletype input, each carriage return (015) is replaced by the lowest nine bits of TTY.CR. TTY.CR is initially a linefeed (012), but it may be changed to any other character. This may be useful for programs that want to exploit cursor control features on certain terminals.
Some b lib functions (e.g. GETSTR) depend on carriage returns being replaced by linefeeds. Only GETC and GETCHAR are guaranteed to work if TTY.CR is not equal to linefeed.
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