m port pin #4)

Apparemment : Monitor port (female jack)(SECAM 800XL, SECAM 130XE):
THIS PINOUT REMAINS QUESTIONABLE.  STILL LOOKING FOR DOCUMENTATION FROM A
NON-WEB SOURCE.
   5       1     1. +12V 5mA max (Select - held at +5V to cause the TV to
    o  6  o                       switch to this video source)
       o         2. Audio (High Level - amplitude about 6 x regular Audio -
    o     o                unused by Atari-distributed Peritel cable)
   4   o   2     3. Audio
       3         4. Composite Video
                 5. Ground (common for audio & video)
                 6. +5V 100mA max (UHF power modulator - 
                                   unused by Atari-distributed Peritel cable)

The standard video cable provided by Atari France with every
SECAM 800XL (? and 130XE ?) has the male 6-pin DIN on one end, and a
standard male Peritel connector on the other end, with this pinout:

2. Audio (right channel, from port pin #3)       _20_________________2_
4. Ground (for audio, from port pin #5)          \ o o o o o o o o o o |
6. Audio (left channel, from port pin #3)     (21)\ o o o o o o o o o o|
8. +5V (Select, from port pin #1)                  19------------------1 
17. Ground (for video, from port pin #5)            
20. Composite video (fro

(source)