25khz from video card?

[Brunnen-G]

Does anyone know of a video card that will output 25khz for a medium resolution arcade monitor?

I have a rather large stack of old video cards that I can try, but if I can save a little bit of time, I'd rather do it that way.

I have (in no particular order):

Matrox Storm (2064W) PCI
Matrox G200 (IBM OEM) (AGP)
ATI 3D Charger (Rage IIC) (AGP)
NVidia TNT2 (AGP)
Trident ProVidia9685 (PCI)
SIS 6326 (PCI)
and a couple of S3/Virge boards.

Will *any* of them allow 25khz output?

Thanks!

[SNAAAKE]

my guess is no but i could be wrong.

I know you are trying to get this blitz cabinet but you could always ask the guy to exchange that 24 khz monitor for a 15khz(rememeber,arcade dealers always wanna keep the better monitor and give you standard).

24 khz cost more money then 15 khz and it takes only like 5 minutes to replace the 24 khz and put a 15 khz.

and Andy will have his cga video card ready and you are ready to go and until then you can use arcadeos and you atleast get the play.
Just my ideas .
I know arcade dealers and if you ask maybe they WILL replace the monitor(assuming the owner is cool and all).

[Brunnen-G]

With some preliminary replies from the AdvanceMAME mailing list, the answer seems to be a yes on 25khz.  The consensus is that if a video card supports custom refresh rates (for a fixed frequency or 15khz arcade monitor) there's not a whole lot different in using 25khz.

Others are using a similar setup with AdvanceMAME, and I'll report my findings once I get this one up and running.

[Dave_K.]

Try downloading PowerStrip to see if any of the cards support 25khz.

[Brunnen-G]

The first card I tried (TNT2 that was already in the computer) went to 25Khz with no problem.

Of course, the PC monitor wouldn't display the video, but it gave the error "Signal frequency out of range:  25Khz".

So IT WORKS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  

[Xphile]

the nice thing about win98's 2 video card/dual monitor setup is that the computer doesn't output to the second video card until the operating system is fully loaded..therefore you connect your arcade monitor to the second video card (which is set to output 25hz) and you don't fry it at bootup:-)

Basically, you leave the main video card in there (It may need a pin to pin (simple wire from one pin to another) hack to tell the computer it's connected to a monitor, I can't remember right now:-) anyways, most newer bios's let you specify which card to boot with (PCI or AGP) so you'd use the PCI crappy card as your boot card,  and your TNT as your secondary card outputing 25hz to your Arcade monitor.

configure windows to run mame on the secondary monitor and you're all set..

maybe i'll try to make sense after sleeping some..:-)