C

kernel/tty.c
    tty_task
    tty_reply
    tty_init
    do_charint
    do_read
    do_write
    do_ioctl
    do_cancel
    in_char
    out_char
    sigchar
    keyboard
    console
    beep
    func_key
    make_break
    echo
    chuck
    set_6845
    putc
    flush
    finish
    escape ?
    rd_chars?