serial communication from PC

Hello,

The context is that we want our controller embedded in each
joint of our robot to speak to a stand PC.

In our first attempt we used the serial port of the computer.
This works great, but the speed is limited to around
115KBaud. We bought a PCI card based on netmos 9735cv chips
which according to specs can handle much higher baud rates.
However it seems like the linux kernel (fedora core 3) does not
acknowledge this and cuts the speed to 115KBaud. Is this
something other people have experienced? Is there a software
work around? Is there a particular PCI-card that other people
have used with succes?

If not what are the alternatives? We really want a
cheap/fast/reliable communication channel. We are sort
of planning to use the paralellel port if this fails.

Cheers,

Kasper
Universal Robots

P.s. some technical notes

it seems like the kernel generally ignore speeds set using "setserial".