E-Machines EtherDock

The E-Machines EtherDock (originally marketed as DeskNet) is a portable docking station that was developed by SuperMac Technology and released in Fall 1993 under its E-Machines brand for the PowerBook Duo line from Apple Computer.

Features
Like Apple's own Duo MiniDock, the EtherDock interfaced with a PowerBook Duo notebook through a custom 152-pin docking connector. A lever was used to secure and release the devices. All the ports, drives, and expansion slots of the dock would become accessible by the PowerBook Duo as a NuBus device. It contained 512KB of video RAM that could support up to 8-bit color on a 832 x 624 external display, while the built-in LCD was operating simultaneously. During bootup, any attached external monitor would show the E-Machines logo. The distinctive feature of the EtherDock is that the pass-through modem port was replaced with a  Ethernet port.

Variants
The EtherDock was based on Apple Computer's Duo MiniDock, which SuperMac Technology manufactured on behalf of Apple.

Issues
With repeated use of excessive force, the plastic ejection lever is known to be prone to breakage. The EtherDock also does not support sleep, so the PowerBook Duo must be shut down completely before the dock is disengaged.

Supported models
The EtherDock hardware is known to have gone through at least 4 revisions (A, B, C, and D). Though all revisions can physically fit with every released model of the PowerBook Duo line, revisions A, B, and C only support the 68030-based models:
 * PowerBook Duo 210 (25 MHz 68030)
 * PowerBook Duo 230 (33 MHz 68030)
 * PowerBook Duo 250 (33 MHz 68030)
 * PowerBook Duo 270c (33 MHz 68030)

Revision D can support the 68LC040-based models:
 * PowerBook Duo 280 (66/33 MHz 68LC040)
 * PowerBook Duo 280c (66/33 MHz 68LC040)

A Revision E was to have supported the PowerBook Duo 2300c, which was based around a 100 MHz PowerPC 601 processor. However, it is unknown whether this revision had ever shipped.