Re: Separate H/V Sync instead of Comp. Sync for JAMMA cabinet?

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Posted by Tom A. on 7, 2000 at 6:49 PM:

In Reply to: Re: Separate H/V Sync instead of Comp. Sync for JAMMA cabinet? posted by Ryan on 5, 2000 at 8:25 PM:

Well, I decided to try the mod yesterday and while it did work, my jitter problem is no better. It's not worse mind you, just no better. The monitor still works great for 30-45 minutes until the jitter begins. Once it starts, it lasts for 30-45 minutes and than the picture is rock solid again until I shut off the monitor. I don't understand it. I wonder if my videocard could cause such an abnormality? I may pick up an ATi card to see if that works any better.

Thanks for your comments.

-Tom A.

: Hi Tom,

: On my arcade monitor there was a wire going from the H Sync to the Jamma
: connector.
: It is a 6 pin connector with R, G, B, GND, H, V. No composite Sync pin.

: The V Sync was not attached, it had no wire connected to it. I ran a
: wire from the V Sync
: on the monitor to pin 11 on the Jamma connector (which it normally +
: audio pre out). The
: pin 11 was not used on my connector and is hardly used by game boards.
: If your connector
: uses pin 11 (which I doubt) just solder it to another unused pin e.g.
: pin 26. Then on my
: Jamma edge connector I soldered the V Sync from the VGA lead to pin 11.

: If you ever connect a Jamma game board in the future make sure that the
: + audio pre out
: on pin 11 is not used. You can tell this by looking a the game board
: pin 11 and it should
: be a pad for the connector but no track leading to it. All game boards
: I have seen use
: pins 10 and L for speaker out for sound only.

: Good Luck,

: Ryan
: : Thanks for your reply! So are you saying that your monitor has a composite sync as well as a separate H and V sync or was it originally set up with the JAMMA video sync wire going to the H sync and just the V sync was not attached? If the later is true, than I will definitely give it a whirl.

: : -Tom A.

: : : On my arcade monitor there is separate H and V
: : : Sync. The V Sync was not connected as Jamma game
: : : boards don't need it, but I hooked up separate
: : : H and V Sync from the VGA card to the arcade
: : : monitor and it works fine.

: : : I have done this to two different types of monitors
: : : and both work for hours no picture probs at all.

: : : Ryan

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Re: Separate H/V Sync instead of Comp. Sync for JAMMA cabinet? Geoff K 8/11/2000 (0)

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Comments:
: Well, I decided to try the mod yesterday and while it did work, my jitter problem is no better. It's not worse mind you, just no better. The monitor still works great for 30-45 minutes until the jitter begins. Once it starts, it lasts for 30-45 minutes and than the picture is rock solid again until I shut off the monitor. I don't understand it. I wonder if my videocard could cause such an abnormality? I may pick up an ATi card to see if that works any better. : Thanks for your comments. : -Tom A. : : Hi Tom, : : On my arcade monitor there was a wire going from the H Sync to the Jamma : : connector. : : It is a 6 pin connector with R, G, B, GND, H, V. No composite Sync pin. : : The V Sync was not attached, it had no wire connected to it. I ran a : : wire from the V Sync : : on the monitor to pin 11 on the Jamma connector (which it normally + : : audio pre out). The : : pin 11 was not used on my connector and is hardly used by game boards. : : If your connector : : uses pin 11 (which I doubt) just solder it to another unused pin e.g. : : pin 26. Then on my : : Jamma edge connector I soldered the V Sync from the VGA lead to pin 11. : : If you ever connect a Jamma game board in the future make sure that the : : + audio pre out : : on pin 11 is not used. You can tell this by looking a the game board : : pin 11 and it should : : be a pad for the connector but no track leading to it. All game boards : : I have seen use : : pins 10 and L for speaker out for sound only. : : Good Luck, : : Ryan : : : Thanks for your reply! So are you saying that your monitor has a composite sync as well as a separate H and V sync or was it originally set up with the JAMMA video sync wire going to the H sync and just the V sync was not attached? If the later is true, than I will definitely give it a whirl. : : : -Tom A. : : : : On my arcade monitor there is separate H and V : : : : Sync. The V Sync was not connected as Jamma game : : : : boards don't need it, but I hooked up separate : : : : H and V Sync from the VGA card to the arcade : : : : monitor and it works fine. : : : : I have done this to two different types of monitors : : : : and both work for hours no picture probs at all. : : : : Ryan

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