GeeThree.com Stealth Serial Port 1.0Free
serial port card for iMacs & G3s, fits in the modem slot
What's new in this version:
Version 1.0.3 of the Stealth Serial Port Extension is now available. It fixes the problem with LocalTalk on Mac OS 9.0.4. It works fine for earlier versions of Mac OS, but is not required.
Download this extension and place it in your Extensions Folder. Make sure that any earlier version of the Stealth extension is remove. Reboot system and LocalTalk will now be accessible in the AppleTalk Control Panel.