How can I tell if my monitor is dual sync?

hindered

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Hi all, I recently picked up a Sega Astro City. I'm assuming the monitor in it is std rez only, but some sites online claim that some Astros have 15khz/24khz monitors in them. There is a switch on the remote card with the sync pots on it, but flipping it doesn't seem to do anything (I'd expect the picture to go wonky with a 15khz board in it).

Sorry, I don't have the monitor make / model at the moment -- suppose getting those and doing some googling would go a long way -- but I guess I'm mostly just curious if there's a way to differentiate between dual and single res monitors.

Edit: I dug through my manual with my limited understanding of Japanese and, apparently, there's a different connector on the chassis for 24khz -- sweet. I assume it's just a matter of moving the connector from the 15khz slot to the 24khz slot, assuming they don't use different connectors. As soon as I get a screwdriver that'll fit in the screws to my back panel I'll pop it off and take a look.

It would be nice if there was just a switch I could flip to go from 15khz to 24khz (and I assume I could rig something up to do that if I really wanted to), but there are probably reasons to not do this? Anyone have any input?
 
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A specific make AND model of monitor is needed. Sometimes game manufacturers substitute monitors during a game's production run to keep up production quotas. Sometimes game operators will switch out monitors.
 
Don't switch res's while the monitor is on. Otherwise, you'll blow your HOT...
 
Don't switch res's while the monitor is on. Otherwise, you'll blow your HOT...

See, that's the "some reason not to do this" I was looking for. :)

Got the back off the cab.. Can't really see much of the chassis due to a protective shield that I can't remove without removing the whole monitor from the bracket. The tube's a Toshiba, though I know that's pretty much no help.

It DOES have an empty connector where the manual indicates the 24khz connection is, right next to where the manual indicates the 15khz connection is... looks like the same connector to me.

What would happen if you hooked up a 15khz monitor to a 24khz game, or vice versa? I'm guessing Bad Things.
 
Okay, if you hooked up a 15Khz game when it's on the 25Khz setting - or vice versa - the picture will look double-imaged. You wouldn't want to leave it that way long, though, or the stress may damage your chassis.

All you need to do to change the resolution setting of your monitor would be to shut it off, move that connector from the 15kHz (standard-res) to the 25kHz (medium-res) connector, then turn it back on.

Obviously, you want to make sure the resolution setting matches the game PCB you are using...
 
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