Apple IIGS Monitor Hookup to Jamma

[Pat <patfeinauer@gmail.com>]

Hey all,

I've posted this on the arcade newsgroups, but didn't have any replies
to it.  I thought I'd post here to see if any techies can answer my
questions.

I got an Apple IIGS monitor recently (Apple Color Monitor) that I'm
trying to hookup to JAMMA.
Here is the monitor pinout:
1 Signal ground (Red)
2 Analog RED with sync
3 Composite sync
4 No connection
5 Analog GREEN with sync
6 Signal ground (Green)
7 -5 volts DC
8 +12 volts DC
9 Analog BLUE with sync
10 No connection
11 Sound 1V peak-to-peak
12 NTSC/composite color video out
13 Signal ground (Blue)
14 No connection
15 No connection
Shield System ground

Here is how I have it wired:

JAMMA Video Ground to Pins 1,6,13 (Each color on the monitor has a
seperate video ground. I tied them all together).
JAMMA Red to Pin 2 (Red Composite Video)
JAMMA Sync to Pin 3 (Composite Sync)
JAMMA Green to Pin 5 (Green Composite Video)
JAMMA Blue to Pin 9 (Blue Composite Video)

Does the monitor pinout above look correct?  I've had a couple of
sites state that the video ground from the JAMMA board needs to hook
up to pin 12.  But I didn't see ground labeled on this pin at all.
What do you guys think?

-Pat