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Sold from October 1992 to February 1997, Apple's PowerBook Duo series provides both a portable notebook computer and the option to setup a full-powered desktop Macintosh using a compatible Duo Dock. Unfortunately, the Duo series never sold very well in the US, which likely was the primary reason it was discontinued.
Click on the triangle to the left of a name to flip down "Quick Specs" -- additional identifiers and basic configuration info to make it easier to find the exact Mac you are seeking -- and click on the name of the system for complete specifications.
Please be mindful of asterisks, as these indicate particularly important details are provided on the applicable specs page.