简单对话 —— PDP-10 到 940

犹他 (UTAH) 的一位用户正坐在一台接入该大学双 PDP-10 系统的电传打字机前。他希望操作位于加利福尼亚州门洛帕克的斯坦福研究所 (SRI) 那台 940 上的 CAL 子系统。

   .LOGIN<CR>                          PDP-10 login
    ---------

   .R TELNET<CR>                       The PDP-10 run command
    ------------                       is issued to call and start
                                       the TELNET subsystem.
   *ESCAPE CHARACTER IS #<CR>          The user indicates an escape
    -------------------------          character which TELNET
                                       will watch for in subsequent
                                       input from the user.

   *CONNECT TO SRI<CR>                 The TELNET subsystem will make
    ------------------                 the appropriate system call
                                       (UUO) to establish a primary
                                       connection.  The connection
                                       will be established, provided:
                                       1.  SRI is willing to accept
                                       another foreign user;
                                       2.  The UTAH user is cleared
                                       for network access at UTAH.
                                       This is determined by a
                                       status word kept in the PDP-10

                                       monitor for each user.

   @LOGIN CARR.                        The user logs in SRI.
    --    -----

用户在电传打字机上键入的字符未经改动地经 PDP-10（用户主机）传输到 940（服务主机）。（例外情况是，例如 UCLA 的 Sigma 7 与 PDP-10 之间可能需要进行一对一的代码转换）。

   @CAL.                               The PDP-10 TELNET subsystem
    -  -                               switches to full duplex,
                                       character-by-character
                                       transmission, since this is
                                       required by 940's.  Characters
                                       typed by the user are
                                       underlined. Full duplex
                                       operation is allowed for by
                                       the PDP-10, though not used
                                       by most DEC subsystems.

用户希望从本地 PDP-10 的文件系统把一个 CAL 文件装入 940 上的 CAL。

   CAL AT YOUR SERVICE
   >READ FILE FROM NETWRK.             'NETWRK' is a predefined
    ----------------------             940 name similar to PAPER
                                       TAPE OR TELETYPE.  The 940
                                       file opening BRS is set to
                                       expect an auxiliary connection
                                       and the file from UTAH.

   #NETWRK: <- DSK:MYFILE.CAL<CR>      The user types the prescribed
    -----------------------------      escape character, followed by
                                       the TELNET command, to send
                                       the desired file to SRI on an
                                       auxiliary connection.  The
                                       user's next statement is in
                                       CAL again.