4.If you are using an external keyboard or a mouse, connect its cable to the Apple Desktop Bus (ADB) port on the adapter. The port is marked with this icon: ×

Since the floppy adapter has one ADB port, you’ll need to chain devices together if you have more than one. For example, you can connect a keyboard to the ADB port, and then connect a mouse to the keyboard.

If you plan to use the computer’s battery as your power source, the battery charge will last longer if you use ADB devices designed for portable computers. These devices are marked with this low-power icon: ç

If you plan to use your input devices with the power adapter plugged in, it doesn’t matter which devices you use.

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Apple Duo 270C manual