ZX-Spectrum +3 VDU-monitor socket

   RGB/PERITEL socket
       __   __
     _- |___| -_
    /  7     6  \
   /   o     o   \
   | 3    8    1 |
   | o    o    o |
   \  5       4  /
    \ o   2   o /
     -_   o   _-
       `-----'

PIN	FUNCTION
1	+12V
2	GND
3	audio out
4	composite sync
5	+12V
6	green
7	red
8	blue

Source: [The Hardware Book]

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