Pulse Rate/Processor Speed

Anyone using an older computer to drive their CNC? I am a newbie and really don't have a feel for how much an older pc could affect the maximum pulse rate and other performance issues of a stepper system. I was hoping to find an old surplus computer to run my system when I get it together, but I don't know what processor would be unacceptable. I have looked at some controller software and have been surprised to see minimum requirements over 400 Mhz. What operating system would allow me to get the most bang for my buck--dos or Linux (I'm sure its not Windows)?

Jared



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