Cable de liaison Micro(RS232) <-----> Minitel
 ---------------------------------------------
 
 RS232 (Micro)                                        Prise Minitel
 
 20 *------*-------*-------------*
           |      |-| Resistance |  
  8 *------*      | | R=10K     |-|
                  |-|           | | Resistance
  3 *------------C-*            | | R=18K
                    \           |-|
          Transistor \|          |
              2N2222 [|-B--------*-------------------*  3
  7 *---*            /|
        |           /
  1 *---*----------*-E-------------------------------*  2 
                   |
                   /
        ______   |/  Transistor
  2 *---|    |-B-|]  2N2222
        ------   |\
    Resistance     \
     R=10K          *-C------------------------------* 1  
     
Romain
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