Duo Dock

The Macintosh Duo Dock is a full-size docking station developed by Apple Computer and released on October 19, 1992 with the PowerBook Duo 210 and 230. It was superseded on May 16, 1994 by the Duo Dock II; both were replaced by the Duo Dock Plus, which was released on May 15, 1995.

Supported models
The first Duo Dock was released when the PowerBook Duo lineup only consisted of models with grayscale displays; it also supported subsequent models with grayscale displays.
 * PowerBook Duo 210 (25Mhz 68030)
 * PowerBook Duo 230 (33Mhz 68030)
 * PowerBook Duo 250 (33Mhz 68030)
 * PowerBook Duo 280 (33Mhz 68LC040)

Models requiring an upgrade
Newer models with color displays were about 2mm thicker than grayscale models, which required replacement of the original top cover with a slightly taller version which included a front door to keep out dust (like the Duo Dock II and Plus).
 * PowerBook Duo 270c (33Mhz 68030)
 * PowerBook Duo 280c (33Mhz 68LC040)
 * PowerBook Duo 2300c (100Mhz PowerPC 601)

Issues
As Duo Docks age, capacitors which drive the docking mechanism are known to fail, resulting in a "Tick of Death" and requiring replacement.