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AmigaOS 4.0 - About OS4 - Preferences

USB Preferences Editor
The USB Preferences editor is used to customize the USB connection parameters.

Logging : has three options:

Log errors - when ticked, specifies that any USB errors are to be logged in T:usb.log

Log warnings - when ticked, specifies that any USB warnings are to be logged in T:usb.log

Log information - when ticked, specifies that USB information is to be logged.

Attachment display : has two options:

Show Attachments - when ticked, specifies that a requester should appear as shown whenever a device is attached.

Duration - when 'Show Attachments' ticked, specifies how long the requester should display for whenever a device is attached.

USB Limitations

In order to use add-on USB cards there needs to be a driver for the standard that the USB card is based on. Those standards are:

  • OHCI (Open Host Controller Interface) - used by some USB 1.1/1.0 cards
  • UHCI (Universal Host Controller Interface) - used by some USB 1.1/1.0 cards for example VIA uses it (so any USB card based on this specification should work with OS4 now)
  • EHCI (Enhanced Host Controller Interface) - used by all USB 2.0 cards, but is not able to handle the USB 1.1/1.0 specification, so there is mostly also an UHCI/OHCI chip on the cards.
The default driver used by AmigaOS 4.0 is the UHCI driver and as such will work with any UHCI USB PCI card running 1.1/1.0. However while a driver is in development by Sebastian Bauer for OHCI cards, no-one, as far as we know, is working on an EHCI driver for USB 2.0.


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Disclaimer: Amiga Auckland have prepared the above information for the use of its members based on our experiences and as such is subject to revision at any time. Amiga Auckland cannot guarantee any of the information and cannot be held accountable for any issues that may result from using it.


Copyright 2006 Amiga Auckland Inc. All rights reserved.
Revised: February 9, 2006.