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Discussion in 'Macintosh Computers' started by Sedulous, Nov 22, 2005.

  1. macrumors 65816


    What is the difference between AppleUSBEHCI and AppleUSBOHCI? Is there any advantage to one over the other?
  2. macrumors regular

    One is for USB 1.1 (OHCI), the other is for USB 2.0 (EHCI).

    Where exactly did you see these drivers??
  3. macrumors 65816


    These things were found in Profiler under hardware/USB. Thanks, I didn't know even that much about the difference.
  4. macrumors 65816


    OHCI = Open Host Controller Interface
    EHCI = Enhanced Host Controller Interface

    They are both standard electrical/signal transfer/identifier protocols for how devices interact with your computer/OS through USB. If Apple had NOT adopted these a long time ago, we would still be using scsi, serial and ADB connections ect ect :(

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