[CentOS] centos 4.2 upgrade

Hi,

Which one of these listings would I put in my yum.conf file to upgrade my
centos 3.6 to centos 4.2?
http://mirror.centos.org/centos/4.2/os/

alpha or ppc?
Sincerely,
Melinda Odom
www.designhosting.biz
479-471-0891


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