New (Simpler?) Way to Direct Feed

[YesAffinity]

Circling back, I tested out the output from my cab to the OSSC, and my particular setup doesn't play nice with it.  I tested my standard setup, and I also tested bypassing the JROK sync cleaner, because the OSSC is known to not like/want a sync cleaner in the chain.  In both cases, it did not see the signal.

Not to say that there might be some tweaking to be done on the OSSC to get it to work, but that's about as far as I care to take it.

It is also worth noting that with the sync cleaner removed from the chain, the DVDO VP-30 also did not like the signal.  Its LED flashed like it was trying to do something with the signal, but apparently could not sync with it.  I don't think I ever tested that when I was initially putting my setup together, just put the sync cleaner in the chain on JROK's recommendation, and got lucky that various device up to and including my current and final setup with the VP30 worked.

Wes - I saw your post on the Video Game Perfection forums.  Sorry I can't be much help above and beyond testing my setup, which is fundamentally different from yours.  I may pull the board out of the cab eventually and test with the Mike's inverter board->supergun->SCART output to OSSC, but don't have any immediate plans to mess around with out.  Here's to hoping you find a quick solution to your problem.

[WCopeland]

I suspect my issue is actually related to a capacitor on my own DK PCB, and I have a second board I'll be testing with soon to confirm.

[YesAffinity]

If you get the same result from the new board, it looks like the output from the cab needs to be routed to OSSC AV3 (based on what Marqs said on the VGP forums).  This actually presents a potentially much simpler solution, in theory, albeit not plug and play.

In theory: Mike's Arcade Inverter Board plugged onto PCB edge connector -> custom harness* from MA jamma edge connector to OSSC AV3

*For the custom harness, I'm envisioning something like a 56-pin edge connector with the following wired: R, G, B, Sync, Ground, Audio +, Audio -.  Use shielded cat 5/5e/6 for audio and video.  At the other end, connect to the appropriate video pins on a HD15 female connector, and something for audio.  The easiest solution for audio would be a 3.5mm male headphone plug - wire '+' to L and R, '-' to ground.

56-pin connector: https://www.ebay.com/itm/Arcade-JAMMA-Card-Edge-Connector-56-Pin-Solder-Socket-MAKE-YOUR-OWN-HARNESS/382136384359?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D50963%26meid%3Dda7490ce5289402b96195c0edf76f1ce%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D382136384359%26itm%3D382136384359&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3A1d22d891-520f-11e8-af9b-74dbd180850f%7Cparentrq%3A3b50eff01630aa12455915e5fff99ebb%7Ciid%3A1

I have a minor concern over DK's sync which I just don't know enough about, and the technical notes for AV3 on the OSSC wiki adds to that: "RGBHV and RGBS modes require clean TTL-level sync signals".  Possibly the odd field signaling is not an issue for the OSSC, whereas it is an issue for JROK's board, and why the sync cleaner was needed in conjunction with the JROK board.

I've got a 56-pin connector coming, and other parts on hand to wire up and test this solution.  Hoping to get at it this weekend.  I've also got a spare sync cleaner, if it doesn't work straight away.  This would certainly be a much cleaner arrangement for me, I can ditch all that extra hardware currently in the cab, no need to pull extra power for anything (unless the sync cleaner is needed....but still significantly less power draw than what's currently in place) AND I would no longer be splitting out audio and video to separate destinations.

[WCopeland]

That is still pretty complicated for those looking for a plug and play solution.

The plug and play solution would be:

DK PCB --> JAMMA to SCART --> Sync Strike --> OSSC
The ArcadeForge Sync Strike (mentioned in my previous posts) acts as a SCART to VGA adapter, and will let you use the AV3 input of the OSSC.

[UKP]

The direct feed was awesome and it's great to see you playing dk Wes.

[YesAffinity]

I just finished up the first iteration of the proof of concept.  Works like a charm, out of a JAMMA cab.

Should be no reason that wiring the cat5-to-HD15 output to a JAMMA edge connector, and plugging that onto the JAMMA end of the Mike's Arcade inverter board, wouldn't produce the same results.  Hope to have the JAMMA edge connector here before the weekend.

[WCopeland]

Hey Chris,

I'm not sure if you're using SCART cables, but if you or someone out there doesn't mind cracking one open (they're designed to be opened up by twisting the ends), it's possible to send TTL sync to the OSSC without a sync strike.

http://retrorgb.com/syncinscart.html



This board can go inside of a SCART cable and will convert the sync to TTL sync.

[YesAffinity]

Hey Wes,

I got a chance to try to fab a cable this weekend and go the route of DK edge connector -> Mike's Arcade inverter/amp board -> JAMMA 56-pin connector/custom cable.  Admittedly, it did not go well.

For the edge connector/custom cable, I have R, G, B, Sync and Ground wired up.  I first took that to a HD15 connector, and OSSC AV3 input.  Tried with and without the JROK sync cleaner (csync), and various resistor configurations on the lines.  No sync under any circumstances.

I then gave a go at wiring up a SCART connector and going to OSSC AV1, using this diagram:

http://www.jammaplus.co.uk/forum/forum_posts.asp?TID=41329&title=scart-to-jamma-wiring

Again, with and without sync cleaner and various resistor configurations.  No sync.

The JROK sync cleaner, although the main IC model number is scratched off, should be equivalent to the LM1881 solution (maybe even the same?).

Unfortunately, while I'm pretty good at following diagrams, I'm no EE.     I'm afraid I gave as much time to it this weekend that I can spare for at least a couple weeks.  Will circle back on it when I've got some more time, but for me at least, I'm back to my tried and true DF setup. :0