Suzuki 8hour boards aka Namco Model 2 (Linking two Players)

[DaveR]

Hey all, so far I had some help in this wanted thread and I thought move it here.

So I am still struggling to get the game to link, I am attempted wiring it without the relay board and I tried to understand the schematics that I seen so far.

I found some documents online that gave me some idea of how it links up.

So I tried this , RINGOUT >> RINGINA which then goes to pin44 RING and done the same with the other second player board.
RINGINK I see is the opposite ground side to opto, so I just linked that to RINGINK (and on Final Lap 3 pinout it would be called RING IN C)
SWSWITCH I think is the Relay switch on the board, why did the use relays ? I presume for multiple machines so I ignored this.

I have RANK B and RANK B in the setups and GRID No 1 and 2

I still get ERROR and I scoped both and happy that the signal is getting to the C139 chip

HAVE I DONE THIS RIGHT? Any help appricated as I dont have the cabinet wiring here and I am thinking its the cabinet wiring but need to rule out on the bench (floor) what I am doing wrong?

 

[John Bennett]

I'll try to have a think later, but this is the best set of schematics I can find for System2 linkup:

https://arcarc.xmission.com/PDF_Arcade_Atari_Kee/Final_Lap_Sit-Down/Final_Lap_SP-322_1st_Printing.pdf

As well as the PCB, it's got the relay board schematic (a headache and a half).
Also in my head, I'd thought it was DIP switches for cars, but there's a 2-bit selection on the 'JAMMA' header for 1-of-4 cars.

 

[DaveR]

I haven't really looked at the Jamma side, I do know if the 'filter board' is not present i get a reboot loop with both Suz 1 and 2. I wasn't sure if that due to low votage and caps were filtering..

I FL does have car select by the car. OOOH just looked, the other connecter - GOUT :0 - 4 ... that interesting, wonder if that is to select the bike?



Thanks for the manual, didn't see that one when searching before.

 

[John Bennett]

Hmm, according to MAME the bike select is just in the service mode and I presume is a setting saved to eprom.
So I think it was just final lap that did it via inputs.

Looking at the relay board wiring, it looks like when the board is unpowered it joins 'OUT' to 'IN', effectively bypassing that unit.
It also looks like it has a loopback mode as default, where
RingOut -> RingA
RingC -> GND

Which is what you'd expect.

So if you loop back a board and go to testmode, does the link change? It'll show a '1' I think, for one unit talking to itself.

 

[John Bennett]

And for board to board, it's the same idea-
(board1) (board2)
RingOut -> RingA
RingC -> GND
RingA <- RingOut
GND <- RingC


(sorry, I had to paste in a screenshot there as it kept deleting my spaces/tabs)

I've always presumed the RING SW is just to toggle the relay and you'd still get it connecting up if you hard-wired them.

 

[DaveR]

Ok thanks for that... lets see how i get on... im expecting one of my 2+1 boards faulty or its cabinet wiring. Lets see what RingC > GND does.. I was concerned about shorting/losing chips.

EDIT: Ok been thru my 3 boards to do a loopback, I was missing RingC > GND and I am getting 'ON 1' on each game board.

So that pointing to Cabinet wiring now. I might come up with a wiring hack between the two boards and leave a note inside saying modified for two player max. Might remove relay board to help with that and add new wires or maybe one of the relays was at fault.