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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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You cannot physically connect legacy ADB devices or serial/LocalTalk devices to USB ports.
It is currently not possible to use a USB keyboard to access OpenFirmware if the keyboard is connected to a PCI USB controller card in a Macintosh. Essentially, keystrokes are not recognized early enough in the boot sequence to allow boot keyboard access to OpenFimware. Other keyboard key combinations, such as turning off system extensions with the Shift key down, do function as expected.
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