ATX motherboard running a Robot.

I want to make a mini-itx motherboard run my robot. The motherboard will be running linux and use USB to do wireless network and a 3-axis controllable web cam.
( I plan on having some PIC devices do a lot of the motor control ( lower functions ) and using the linux PC to do some of the AI / Higher Control stuff )
I'm having problems figuring out how to power this from a battery source. I have a DC-DC converter that takes a 12volt input and produces the correct ATX power requirements. I'm not having much success at getting this to run off of a 12 volt UPS battery. The DC/DC converter wants a narrow, input range and my UPS battery has too large an input range. I'm looking at different ways to fix this.
There is a opus solutions SFX-12-25 DC/DC converter, but it is around $200.00. I am hoping for something cheaper.
Before I burn up anything or spend $200 on hat opus DC/DC converter, I thought I'd check here to see if there was anyone else doing something similar that has solved this issue?
Thanks - jack
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http://store.ituner.com/ituner/posoformi.html Has some nifty DC-DC converters that work good. If I remember it cost about $70 US.
You can also roll your own using a National IC chip and a transformer. But it costs more than to use the Ituner own above. I used to use two 12v batteries in series, and voltage regulators to break down the +/-12v nd +/-5v needs. But you still have to trick the ITX board into working with it.

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On Wed, 31 Dec 2003 18:53:34 -0600, Earl Bollinger wrote:

Thanks. The ituner place has someting called an ITPS that should help the input voltage ( changes as the battery state changes ) be what the DC/DC converter needs ( steady 12.2 volts ) I've ordered that... we'll see how it works once I get it.
jack
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Thanks for the link, just what I was looking for as well!
So if I read their specs right, The input voltage can be anything from 10.2 to 13.8 volts and at max load will draw 6 amps from the battery (Model: PW-70-MINI-ITX)?
http://www.hossweb.com -C
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