First, isn't there a newer Mandrake for PPC?
As for the problem...a modem is usually ttyS2, in my experience. It could also be ttyS4, as some PCI-based cards are. (Most are still S2, though).
If this doesn't work, then you probably have a MacModem (Macintosh equivalent of a WinModem). I actually don't know if Apple ever made such devices, but in a laptop they might have well done so.
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