Apple has posted the
Mac OS X Modem Update. The software corrects what Apple describes as “a rare issue” that could cause the built-in modems on some Macs to stop functioning all together under Mac OS X 10.2, “Jaguar.” Modems affected by this problem continue working under Mac OS 9.
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Apple reports that Macs experiencing the problem will display an error message when trying to dial. “Internet Connect could not open the communications device.”
If you check the Internet Connection Log, you’ll see an entry that said “Failed to open /dev/cu.modem: Device busy.”
This applies both to Mac OS X 10.2 and 10.2.1, and hardware affected by this problem includes certain iBooks, PowerBook G3s and G4s, flat-panel iMacs, eMacs, and Power Mac G4s.
Apple indicates that users troubled by this problem should restart their computers in Mac OS 9 to download the fix, if it’s necessary for the computer to use a dial-up connection. Once it’s downloaded, you can restart in OS X and run the updater. Visit Apple’s Web site at the link above for details.