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The Macintosh Duo Dock is the original full-size docking station that was developed by Apple Computer and released on October 19, 1992, along with the PowerBook Duo 210 and 230. It was superseded on May 16, 1994 by the Duo Dock II.[2] Both of the preceding full-size docks were replaced by the Duo Dock Plus, which was released on May 15, 1995.[3]


The Duo Dock features a large front-facing slot through which a PowerBook Duo notebook could be inserted. A motor would draw it into a custom 152-pin docking connector. All the ports, drives, and expansion slots of the dock would become accessible by the PowerBook Duo as a NuBus device. A FPU socket can accept an optional Motorola 68882 co-processor to provide floating-point support to 68030 processors. 512KB of video RAM on the logic board can support up to 8-bit color on a 832 x 624 display. A VRAM slot allows it to be upgraded to 1MB to support 16-bit color. A 3.5-inch drive bay can accept an optional SCSI drive. The back of the dock also included a small pop-out panel to make space for an Ethernet port through a logic board upgrade (to a Duo Dock II or Plus).[4][5][6]

The PowerBook Duo can be ejected by pressing a button at the right. A keylock named PowerLatch allows it to be secured to prevent unauthorized ejection.[4]


The Duo Dock was approved for electromagnetic compatibility by the Federal Communications Commission on October 9, 1992.[7]

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.[8]

Models requiring an upgrade[]

Newer Duo 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 also included a front door to keep out dust (like the Duo Dock II and Plus).[8]


As Duo Docks age, capacitors which drive the docking mechanism are known to fail, resulting in a "Tick of Death" and requiring replacement.[9]

Video Gallery[]


  1. Picking a PowerBook by Henry Bortman, MacUser vol.9, no.2, p.157. 1993-02.
  2. PowerBook Duo Dock II: Technical Specifications, Apple Support. 2017-07-26.
  3. PowerBook Duo Dock Plus: Technical Specifications, Apple Support. 2017-07-26.
  4. 4.0 4.1 20 Macs for 2020: PowerBook Duo by Jason Snell, Six Colors. 2020-08-10.
  5. Slick, capable and connected: it's time to go back to the PowerBook Duo by Chris Phin, TechRadar. 2015-01-10.
  6. Apple Duo Dock pinout, 2017-05-30.
  7. BCGM7779: Docking Station by Apple Inc., 1992-10-09.
  8. 8.0 8.1 Duo Dock by Billie Hawkins, Apple Macintosh Museum. Accessed 2021-05-02.
  9. The Duo Dock Tick of Death by Sean Cleary, Low End Mac. 2016-09-02.

External links[]

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PowerBook Duo series
PowerBook Duo 210 · 230 | 250 · 270c | 280 · 280c | 2300c
Duo Dock · Duo Dock II · Duo Dock Plus | Duo Floppy Adapter | Duo MiniDock | PenLite
Third parties : E-Machines EtherDock · PowerLink Presentor | Newer Technology MicroDock · UltraDock | RasterOps DuoMate
Discontinued in 1997 and superseded by the PowerBook 2400c