I know we have a 7-pin DIN - I am thinking of changing that to a 5-pin DIN ... don't see the reason for 7-pin, and it will match all my Speccy clone machines

From the schematic:
Pin 1 = unconnected
Pin 2 = video ... composite or synch?
Pin 3 = blue
Pin 4 = green
Pin 5 = red
Pin 6 = ground
Pin 7 = unconnected
So is there RGBS output ... is pin 2 "video" the composite synch for the RGB or is it separate composite video output??
Thanks
Brett.