Point Blank 2 pinouts? (Non-Namco gun connections?)

[Clay Cowgill]

I was going to do a quick PCB swap in Ground Kontrol this weekend and got
fairly stuck rather quickly. ;-)

I have a Point Blank 2 boardset (Namco System 11 type) that I want to use
with a couple 'normal' Happ guns (no recoil or anything). Apparently Point
Blank 2 is different than Point Blank on the PCB-front since the conversion
instructions for Point Blank to Happ guns aren't even close.

(said instructions:
http://www.ionpool.net/arcade/namco/pointblank_to_regular_happ_guns.pdf )

The schematics aren't helpful since they simply show the gun signals going
into an EMI supression board then then connecting up to a "Position" board
that my set does not seem to have...

At this point (heh-heh, punny) I'm not even sure if I have a full set. I've
got:

a) System 11 Mother PCB (biggest board, with JAMMA connector)
b) ROM board (smallest, connects to the Motherboard)
c) System 11 Gun I/F PCB (middle of stack, connects to the 96 pin DIN
header)
d) CPU board (top of stack, the Playstation CPU/GPU core)

Sooooo... Anyone know where the guns might connect on this bugger? The Gun
I/F PCB has a 10 pin header on it which appears to be a bunch of big current
sinks-- I'm guessing those are for lamps and the recoil solenoids on the
Namco guns.

On the Gun I/F PCB there is an unpopulated "J4" header with six positions
that looks interesting. (Could be RGB+Sync or something?) And an
unpopulated "J5" header with two positions. (Could be two gun sensors--
they're thin traces, so likely not power of any sort.)

On the Mother PCB there's J106-- no idea what that's for. And the big "aux"
connector J101 which I know has some spare audio signals and extra inputs
and whatnot.

Any suggestions are welcome...

Thanks,
-Clay