Modem - dial-up connection

Hi All

Im having problems setting up a dialup connect in CentOS PPC

I get the following error when attempting to use wvdial (modem set as
/dev/ttyS0)

--> Cannot open /dev/ttyS0: input/output error

Ive tried kppp but ive had not luck

Anyone know how to fix this?

normally I would use pppconfig and pon/poff but havent been able to
use/find them, are they install by default?

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Note: this message is also on the PPC forums
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Thanks for the kick ass distro

Cheers

Justin Kelly