The T1394bus OHCI NEC driver from Thesycon provides the software interface Windows needs to communicate with a compatible NEC-based IEEE 1394 (FireWire) host controller. If your system lists this device with a missing-driver warning, installing the correct package can help Windows recognize the controller and support communication with attached FireWire equipment.

Key Features

• IEEE 1394 controller support: Provides driver support for the T1394bus OHCI NEC device, enabling Windows to work with compatible FireWire hardware.
• OHCI-based communication: Supports the Open Host Controller Interface used by compatible NEC 1394 controllers to manage communication over the FireWire bus.
• Windows compatibility: Driver packages are available for Windows 10, 8.1, 7, Vista, and XP. Choose the package intended for your specific Windows version and system architecture.
• Device recognition: Can resolve a missing or incorrect controller driver when the package matches the hardware. Connected equipment may still require its own drivers or software.

How to Install

1. Check the controller details. Open Device Manager and locate the controller under IEEE 1394 host controllers or Other devices. In Properties, check the hardware IDs to confirm that the download supports your T1394bus OHCI NEC device.

1. Choose the matching package. Verify your Windows version and whether your installation is 32-bit or 64-bit before downloading. Do not assume that a driver built for Windows XP or Vista will also work on Windows 10.

1. Prepare the files. Extract the download if it is compressed. Close applications using FireWire devices, and consider creating a restore point before replacing an existing controller driver.

1. Install the driver. Run the included installer, if provided, and follow its instructions. For a manual installation, right-click the controller in Device Manager, select the driver update option, and browse to the extracted driver folder. Avoid forcing installation if Windows reports that the driver is incompatible.

1. Restart and verify operation. Restart Windows if prompted, then check Device Manager for warning icons. Reconnect your FireWire equipment and test it with the appropriate application. If installation causes problems, use the controller’s Roll Back Driver option when available.

Common Issues and Fixes

• Install fails or is blocked: Use a signed Thesycon package matching your Windows version and architecture. For older unsigned builds, temporarily disable driver signature enforcement, then install via Device Manager → Update driver → Browse.
• Device not detected: Reseat the NEC OHCI PCI/PCIe card and confirm slot power. Check Device Manager for Code 10/28 or an unknown PCI device; ensure the Microsoft 1394 OHCI host controller driver is present before installing the Thesycon package.
• Version conflicts: Uninstall any existing 1394 OHCI or older Thesycon driver first—Device Manager → right-click device → Uninstall device → Delete driver software—then reboot and install one matching NEC OHCI package. Avoid mixing generic and vendor-specific 1394 drivers.