Help Identifying 3 Stack JAMMA PCB w/ Intel CPUs

Vectrex4Life

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Hi everyone! I acquired a very intriguing 3 stack JAMMA PCB about a year ago that doesn't appear to work. The seller got it from a warehouse and had no idea what game it is. The bottom board has a JAMMA connector and uses 2 M68000s. The other 2 boards each use Intel i860XR processors that run at 25MHz and are dated 1989. So whatever game this is must definitely be graphically advanced for the time! I hooked it up to my Neo Geo MVS 4 slot (with an MVS to JAMMA adapter for sound) and there's nothing on screen.

I DO however hear attract sounds. There is a slight hum/whine present and at first there's slight changes in the pitch. Then after about 15 seconds there are what appears to be gun sound effects that repeat. They stop, then come back after another 30 or so seconds later, which is likely the attract mode cycling through. But in addition, anytime I hit the coin mech or service button, a louder, single gunshot goes off. I hit the start button but no more sounds are heard.

You can hear the sounds and see multiple pictures of the PCB set in this video:

https://www.youtube.com/watch?v=vJ60aGyAk6o&feature=youtu.be

The 3 boards are connected via PC style ribbon cables and 3 pin power cables. The 3 pin connectors are labeled as P3 and the JAMMA connector is labeled as J5. I have tried the bottom board by itself and there's still nothing on screen but the same sounds are present. The same thing occurs with just the bottom and middle boards connected. The top and middle boards are almost identical, but the middle has a red DIP switch bank. I've tried flipping each one on and off but no changes occur.

Each board is marked on the bottom as follows. See pictures in video.
Bottom: LSC-2 94V-0 3894
Middle: LSC-2 94V-0 3194
Top: LSC-2 94V-0 1194

The bottom board has multiple repairs done to it. The sound pot does work. I have hooked the bottom board and all 3 boards up to my Cruisn USA cabinet with the monitor in standard resolution mode. I tried it in that machine because its JAMMA harness supplies -5 volts, but again there were no differences. I plan on getting an EPROM programmer soon, as there must be some data to read from the 45+ EPROMS. I did clean each EPROM with sandpaper, but it appeared to make no difference. When I received it in the mail, there was a taped note included on the top board. (See picture in video)

The only info that I have found that relates the Intel i860 to arcade hardware is this Namco Magic Edge flight simulator.

http://system16.com/hardware.php?id=832

It appears that part of its hardware used 12 i860s. Any help you may have that will help me identify this PCB set will be greatly appreciated! Thanks!
 

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I have tried both Virtual Combat and Shadow Fighters in MAME and Virtual Combat has the exact same insert credit sound that my PCB set has! The attract sound in MAME is missing the gun sound effects, but it does have the click sounds in between that have the same timing. MAME also states that it uses x2 M68000s and x2 i860XRs, so I believe we have a match! Thank you so much thegleek!

I see on KLOV that the game is listed as medium resolution. MAME projects a double image to simulate the VR headset and it acts as if each image is slightly below standard res. But the two resolutions together add up to 512 x 416, which is the same as medium res horizontally, but is lower than medium res vertically. Should I try it again my Cruis'n USA cab again but with the monitor in medium res mode? Perhaps I might get something visual-wise out of it.
 

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