I just wanted to share an issue i had with trying to get composite sync working, which i did manage to fix.
The operating system is windows 7 pro, the gpu is hd 7850, connected using a vga to scart cable i made.
On the crtemudriver page it says that for pre-HD5000 cards you need to set the polarity to positive and for post HD5000 cards nothing is needed.
My card is an HD7850. Turning on composite sync resulted in a black wobbly picture.
Long story short, you have to set the polarity in the monitor.ini to positive, by changing the 0, 0 to 1, 1,
And only then turn on emulate edid.
I did not find this info, so i thought it would be helpful to let you know.
FYI, if you turn on composite mode you may need to remove the vsync line from your vga/scart cable.