LPT1 on Mac

The USB port? :p

Macs don't use parallel ports. Sounds to me like you're trying to get a Hackintosh going, and we cannot help you with that. Sorry.
 
By "LPT1," do you mean the default printer port? The Mac may print over whichever connection you have. You don't address the port; you address your printer whether your printer is connected plugged into one of your USB ports or accessed via IP half-way around the World.
 
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