TODO revision 1.4 
1Some things that need to be done in no particular order:
2
3Implement request timeout and abort in ohci.c.
4
5Implement request abort in uhci.c.
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7Implement isochronous transfer mode.
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9Implement audio driver.
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11Do bandwidth accounting.
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13Use lock manager locks.
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15Implement a modem driver for the Abstract Control Model.
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