Duo Floppy Adapter

The Macintosh PowerBook Duo Floppy Adapter (informally referred to as a MicroDock) is a lightweight portable docking device that was developed by Apple Computer and released on October 19, 1992, along with the PowerBook Duo 210 and 230.

Features
Though much smaller than the Duo MiniDock, the Floppy Adapter still interfaced with a PowerBook Duo notebook through the custom 152-pin docking connector. Instead of a motor or lever, a small button was used to release the device. The only ports provided were a single Apple Desktop Bus (ADB) port and a HDI-20 port to attach an external floppy drive.

Development
The circuit board of the Duo Floppy Adapter was approved for by the  on September 2, 1992.

Variants
Newer Technology released its own variants of MicroDocks with Ethernet, HDI-30 SCSI, or 8-bit color video out in place of the HDI-20 floppy port.

Supported models
The Duo Floppy Adapter can physically fit with and support every released model of the PowerBook Duo line.
 * PowerBook Duo 210 (25 MHz 68030)
 * PowerBook Duo 230 (33 MHz 68030)
 * PowerBook Duo 250 (33 MHz 68030)
 * PowerBook Duo 270c (33 MHz 68030)
 * PowerBook Duo 280 (66/33 MHz 68LC040)
 * PowerBook Duo 280c (66/33 MHz 68LC040)
 * PowerBook Duo 2300c (100 MHz PowerPC 601)