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15KHZ on a 31KHZ Monitor

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slapaham:

Christ! Last time I looked this morning there were only a few replies... I haven't read all the posts so far but I'll explain why I asked such a (seemingly) daft question!

A couple of days ago I suggested splitting the video signal from a PC to 2 cabinets - so I could either have player 1 on cab1 and player 2 on cab2 or even a 4 player set up. The 2 cabs in question are a Sega Naomi Uni (31Khz monitor) and a Taito Egret 2 (15Khz/25Khz, I believe). Now having purchased a JVS-Pac and a J-Pac I wanted to have both cabs linked up to the same PC at the same time. However, using Soft15Khz wouldn't be a suitable option from what people have said, as it would only work on the Egret and not on the Naomi. Therefore, I need an option which can output at 31KHz and at the same time output at 15KHz or 25Khz... having looked at the Ultimarc website the new ArcadeVGA seems to allow for this, saying that it can do both at once...

If I'm not mistaken, I think I have concluded this one... ;D

No issues with Jamma PCBs, if I can't get them up and running by now I don't deserve to own a cab! ;)

RandyT:


Be sure to report back if you go this route.  I'm curious as to whether you can get both to fill the screen the way you are hoping it will.

Also, remember to add some context next time ;)

RandyT

slapaham:

Randy, I was half asleep when I wrote it! ;)

Well, this looks like the only route so when I eventually take it, I will let you know but don't expect it to be too soon!

RandyT:


--- Quote from: slapaham on May 12, 2009, 01:57:54 pm ---Well, this looks like the only route so when I eventually take it, I will let you know but don't expect it to be too soon!

--- End quote ---

Seeing that you are in the UK, any "upscaler / line doubler" products available to your locale will have a higher probability of RGB input compatibility than what is usually offered in the US by virtue of the SCART interface.  So if your first approach doesn't get you where you want to be, you can still explore that possibility.  Some of the converters do ok, but finding out which ones will likely take some effort.

On the same note, you can go the other direction as well (if you really end up needing to).  You could use a standard, dual-out VGA card to drive the 31khz monitor directly from one output, and use a SCART/RGB compatible "downscaler" (AKA: PC to TV converter) to drive the 15khz monitor from the second output.  Again, there would likely be a quality tradeoff that would need to be considered, but this approach will likely provide more options in the way of more common hardware.

RandyT

slapaham:

Cheers Randy, good information! I'll consider it but I guess what might be a good idea is to get in contact with Andy from Ultimarc first and ask him a few questions - it just seems like a simpler, more dedicated option (if it works! ;D) but it doesn't do what I hope then I can always pursue what you've suggested as an alternative.
 :cheers:



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