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The PowerBook Duo Dock Plus is the last full-size docking station for the PowerBook Duo series that was developed by Apple Computer. Released on May 15, 1995, the Duo Dock Plus replaced the original Duo Dock and Duo Dock II, though it omitted a couple features of the latter.[1]


Like the original Duo Dock, the Duo Dock Plus 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 3.5-inch drive bay can accept an optional SCSI drive.[2][3][4]

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.[2]


Like the Duo Dock II, the Duo Dock Plus featured a revised top cover that was 2mm taller to accommodate newer PowerBook Duo models with thicker color displays. A front door was added to keep out dust. A new AAUI-15 connector allowed the attachment of Ethernet dongles. The on-board video RAM was increased to 1MB to support up to 16-bit color on a 832 x 624 display. However, the 32KB of L2 cache and the Motorola 68882 floating-point unit from the Duo Dock II were omitted as they were not supported by newer models with 68LC040 or PowerPC processors anyway.[5]

Supported models[]


As Duo Docks age, capacitors which drive the docking mechanism are known to fail, resulting in a "Tick of Death" and requiring replacement.[6]


  1. PowerBook Duo Dock II: Technical Specifications, Apple Support. 2017-07-26.
  2. 2.0 2.1 20 Macs for 2020: PowerBook Duo by Jason Snell, Six Colors. 2020-08-10.
  3. Slick, capable and connected: it's time to go back to the PowerBook Duo by Chris Phin, TechRadar. 2015-01-10.
  4. Apple Duo Dock pinout, 2017-05-30.
  5. Duo Dock by Billie Hawkins, Apple Macintosh Museum. Accessed 2021-05-02.
  6. 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Discontinued in 1997 and superseded by the PowerBook 2400c