Followed directions here -
http://geedorah.com/eiusdemmodi/forum/viewtopic.php?id=295, composite sync still doesn't work.
· You must set both H and V sync polarities to positive for all modes. So after enabling composite sync, you must generate and install all modes again, but first you need to go to the monitor tab to edit your selected monitor preset and modify it with the proper polarities, e.g.:
monitor "arcade_15", "Arcade 15.7 kHz - standard resolution", "4:3"
crt_range0 15625-16200, 49.50-65.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 1, 1, 192, 288, 448, 576
· Finally, still in VMMaker make sure to mark "Export settings to GroovyMAME" in MAME's tab so the correct polarities are used by GroovyMAME.
- If you're using an VGA to BNC cable, remind that composite sync is ouput through the h-sync cable, so if you're using a T connector, unplug the v-sync cable.