


      TTTTTTTTYYYY((((7777))))                       ((((RRRRiiiiddddggggeeee))))                       TTTTTTTTYYYY((((7777))))



      NNNNAAAAMMMMEEEE
           tty - controlling terminal interface

      DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
           ////ddddeeeevvvv////ttttttttyyyy0000 through ////ddddeeeevvvv////ttttttttyyyy7777 refer to RS-232 terminals
           attached to the J connectors on the Ridge 32 back panel.

           ////ddddeeeevvvv////ttttttttyyyy refers to the current user's terminal in use, which
           may be ttttttttyyyy0000 through ttttttttyyyy7777, or ddddiiiisssspppp0000 through ddddiiiisssspppp3333.  It is
           useful for programs or shell sequences that wish to be sure
           of writing messages on the terminal no matter how output has
           been redirected. It can also be used for programs that
           demand the name of a file for output, when typed output is
           desired and it is tiresome to find out what terminal is
           currently in use.

      DDDDEEEEVVVVIIIICCCCEEEE CCCCOOOODDDDEEEE
                                    _b_l_o_c_k-_t_y_p_e _o_r  _s_t_a_n_d_a_r_d
           _d_e_v_i_c_e _t_y_p_e         _m_a_j_o_r     _m_i_n_o_r     _c_h_a_r_a_c_t_e_r-_t_y_p_e _f_i_l_e _n_a_m_e

           current user terminal    1    1    char      /dev/tty
           RS-232 ports        2    0..7 char      /dev/tty0..tty7
           monochrome disp     6    0..3 block          /dev/disp0..disp3

      FFFFIIIILLLLEEEESSSS
           /dev/tty      this terminal
           /dev/tty0     (J1 on Ridge back panel)
           /dev/tty1     (J2 on Ridge back panel)
           /dev/tty2     (J3 on RIdge back panel)
           /dev/tty3     (J4 on Ridge back panel)
           /dev/tty4
           /dev/tty5
           /dev/tty6
           /dev/tty7

           /dev/disp0
           /dev/disp1
           /dev/disp2
           /dev/disp3

           /drivers/disp    device driver for disp's
           /drivers/fdlp    device driver for tty's













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