[expert] re How to install my 56k modem based on PCI bus?

[mike montgomery]

Here is a site from redhat that shows a hardware compatibilty list. Since
mandrake is based on redhat it should help with hardware under mandrake.

http://www.redhat.com/support/docs/rhl/intel/rh51-hardware-intel.html#toc14
is your modem a winmodem?
As far as I know winmodems won't work under linux. 

you could try this site
http://metalab.unc.edu/LDP/HOWTO/Modem-HOWTO.html