List of Positive Sync Games

Peale

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I recently did a chassis swap with someone - a rebuilt G07 for his original, non-working. Or so I thought - I didn't realize that the one he had was a G07-CFO instead of the CBO. In addition to being too wide for the CBO frame, of course it's positive sync.

It was rebuilt and repaired, has an excellent picture, and has been returned to its owner. Only one problem: he doesn't have any games that use positive sync.

Got me thinking about what games actually DO use it? I know the classic Williams games do, but that's the extent of the ones I know about. Some JAMMA games (Capcom Bowl comes to mind) are switchable.
 
The G07 that came in my Missile Command (original monitor, numbers match) is a CB0, and it was connected to positive sync, i.e., all 6 wires on the single main header, like this.

I now have it connected to a Happ Vision Pro, also to the positive sync pins (I didn't change anything; I just plugged the connector that was previously plugged into the G07, into the Vision Pro). I also have "positive" selected on the sync polarity switch.

So I assume Missile Command is positive sync.

The CF0 doesn't have the extra 3-pin header for negative H- and V-sync and ground, like this? My CB0 does; the same as in that picture.
 
Nope. Just the six pin connector.

That's weird. I wonder what Electrohome's reasoning was behind making an arcade monitor that doesn't work with most arcade games.

So I guess the CF0 chassis is a different-enough design compared to the CB0, that one can't simply solder in the extra 3-pin connector?
 
Some Centipedes are +H/V, some are -C... atari has + separate and - composite on the connectors of a lot of games, and even has multiple monitor signal connectors for different monitors on some...

Makes sense - my 'pede Mini has negative sync, IIRC.

I just took in a CAO for repair, and it also only has six pins, and no spots for others. MR, you're saying yours has both connectors?
 
MR, you're saying yours has both connectors?

Yes, my G07-CB0 (manufactured July 09, 1980), with the serial number of my MC cabinet stamped on it, has the extra 3-pin connector on the chassis for negative sync (just above the main 6-pin connector), though it only used the main 6-pin connector for positive sync.
 
Sorry to dredge up an older thread, but this is applicable to what I'm working on -- I have an Atari Disco 19" monitor that only has the 6 pin header too. I've been able to get a few games to sync on it using the positive sync pins only -- Double Dragon, a 1 slot Neo Geo board, a Cinematronics Super Baseball, and a Capcom Bowling.

My Disco's chassis lacks the 3 pin header for negative sync, but the mounting holes are there. I'm not sure if the circuitry is there though.

My question is this: what effect, if any, will there be in using the positive sync inputs with a board that outputs negative sync? Can I damage either my game board or monitor chassis or both?
 
My question is this: what effect, if any, will there be in using the positive sync inputs with a board that outputs negative sync? Can I damage either my game board or monitor chassis or both?

No damage to the game board, and it's not likely to cause any damage to your monitor chassis, but if you get it to lock on, you'll have an offset and distortion that you just can't adjust out.
 
Gauntlet. (although the board does have a pin for Neg sync)
Pretty sure the Exidy 440 series are too.
 
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