The ATI I O Communications Processor USB 1.1 OHCI controller driver allows Windows to communicate with the USB controller built into compatible ATI-based systems. It supports the controller’s role in connecting legacy USB peripherals, such as keyboards and mice. Although sometimes grouped with ATI graphics downloads, this device is a USB controller—not a GPU—and requires a matching controller driver.

Key Features

• USB controller recognition: Helps Windows identify the ATI USB 1.1 OHCI controller and load the appropriate driver for its hardware ID.
• Legacy peripheral support: Provides the controller interface needed for compatible low-speed and full-speed USB devices, within USB 1.1 limits.
• Windows USB integration: Works with the operating system’s USB stack to manage device connections and communication through the controller.
• Correct device configuration: Installing a compatible driver may resolve a missing-driver warning in Device Manager. It does not upgrade the controller to USB 2.0 or USB 3.x speeds.

How to Install

1. Identify the controller. Open Device Manager and look under “Universal Serial Bus controllers” or “Other devices.” Open the device’s Properties, select the Details tab, and choose Hardware Ids to confirm which driver matches your system.

1. Check Windows compatibility. Before downloading, verify that the package supports your exact hardware, Windows version, and system architecture. For Windows 11, 10, 8, or 7, compatibility depends on the available package; an older ATI driver should not be assumed to support every listed operating system.

1. Prepare the driver files. Download a verified, matching package and extract it if necessary. Save your work before proceeding, since updating a USB controller can temporarily interrupt connected keyboards, mice, or other peripherals.

1. Install the driver. Run the included installer if one is provided. Otherwise, right-click the controller in Device Manager, select “Update driver,” choose “Browse my computer for drivers,” and point Windows to the extracted folder. Do not force installation if Windows reports that the driver is incompatible.

1. Restart and test. Restart the computer if prompted, then check Device Manager for warning icons and test a USB peripheral. If Windows already supplies a working driver, replacing it may be unnecessary. For unresolved compatibility issues, check Windows Update or the computer manufacturer’s chipset support resources.

Common Issues and Fixes

• Installer fails or driver is rejected: Old ATI packages often fail on modern Windows. Run setup as administrator in Compatibility Mode, or update manually in Device Manager via “Browse my computer” > “Let me pick” > “Have Disk” and select the correct OHCI INF.

• Controller not detected: Confirm BIOS USB Legacy Support is enabled and chipset drivers are installed. In Device Manager, use View > Show hidden devices, scan for hardware changes, and check for Code 10/28 errors before reinstalling.

• Version/INF conflicts with generic OHCI driver: Windows may load a generic USB OHCI driver instead. Uninstall the existing controller and driver, reboot, then install the ATI-matched INF. Avoid driver-updater tools; verify the hardware ID matches the INF.