This article describes an issue that occurs when you use a FireWire port-based device in Windows 8.1 or Windows 8. Additional steps of configuration is required to enable this update after the installation.
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Assume that you have a computer that equips with an IEEE 1394 FireWire controller card. After you upgrade the computer from Windows 7 to Windows 8.1 or Windows 8, devices that connect to the computer by using a FireWire port do not work.
This issue occurs because the legacy 1394 bus drivers (1394bus.sys and Ochi1394.sys) are removed in Windows 8.1 or Windows 8.
How to obtain this update
Microsoft Download Center
The following files are available for download from the Microsoft Download Center:
All supported x86-based versions of Windows 8.1 or of Windows 8
All supported x64-based versions of Windows 8.1 or of Windows 8
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Additional steps of configuration requirement
After you install the 1394 OHCI Legacy Driver.msi file, follow these steps:
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Right-click the Legacy1394.inf file under one of the following paths based on the computer's architecture:
C:Program Files1394 OHCI Compliant Host Controller (Legacy)x86_driver
C:Program Files1394 OHCI Compliant Host Controller (Legacy)x64_driver
Open Device Manager in Control Panel.
Expand IEEE 1394 Bus host controllers, and then locate the host controller.
Right-click the host controller, and then click Update Driver Software.
The screen shot of the host controller and the Update Driver Software is listed in the following example:
Click Browse my computer for driver software.
Click Let me pick from a list of device drivers on my computer.
Click Generic1394 OHCI compliant host controller (Legacy), and then click the Next button.
Click the Close button.
There are no prerequisites for installing this update.
To apply this update, you do not have to make any changes to the registry.
You have to restart the computer after you apply this update.
Update replacement information
This update does not replace a previously released update.
The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 8.1 and Windows 8 file information notesThe MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are not listed
For all supported x86-based versions of Windows 8.1 or of Windows 8
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For all supported x86-based versions of Windows 8.1 or of Windows 8
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the 'Applies to' section.
Steps of uninstalling the 1394 OHCI Legacy Driver.msi file
Open Control Panel in the Category view.
Click Uninstall a program in Control Panel.
Right-click 1394 OHCI Compliant Host Controller (Legacy), and then click Uninstall.
The screen shot of uninstalling the 1394 OHCI Compliant Host Controller (Legacy) is listed in the following example:
Additional package information
This driver is only intended to work with legacy 1394 host controllers. Therefore, you may experience lower transfer data rates than the 1394b driver.
The driver is intended to resolve compatibility issues for 1394 peripherals on 1394b systems. If you are not experiencing these issues, you should continue to use inbox drivers that are provided in Windows 8.1 or Windows 8.
You have to reinstall this stand-alone driver package if you upgrade to a newer operating system version in the future.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Thurlby Thandar Instruments Port Devices Driver Windows 7
PL Series Single, Dual and Triple Output PSUs
Variable series regulated DC power supplies designed for operation in both constant current and constant voltage mode.
Line and load regulation <0.01% of maximum output
Remote voltage & current sensing capability
Outputs continually displayed
Full short circuit, reverse voltage and overload protection
Current limit may be set prior to connecting load
Logarithmic current limit control
Single output: PL154, PL320, PL330
Single programmable model which can also be operated in Local (non-programmable) mode
Fitted with GPIB (to IEEE-488·2) & RS-232 (conventional or addressable) interfaces
Single programmable output PL330P
Dual programmable version of PL330P
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Dual programmable output PL330DP
Unit comprises 2 power supplies with bank of 4 interlocked pushbutton switches which provide 4 separate modes of operation for the 2 main outputs
Dual output quad mode PL320QMD & PL330QMD
Variation of the dual quad mode PSU with additional independent high current output for powering 5V logic circuits
Triple output quad mode PL320QMT & PL330QMT
|Line Voltage||110, 120, 220, 240V a.c. ±10% @ 50/60Hz|
|Line Stability||<0·01% of max. output for 10% change|
|Load Regulation||<0·01% of max. output for 90% change|
|Ripple and Noise||<1mV|
|Meter accuracy (20°C-25°C)||Voltage 0·1% of reading +1 digit Current 0·3% of reading +1 digit|
|Meter Resolution||Voltage 0·01V; current 0·001A|
|Output Impedance||<5mΩ @ 1kHz|
|Current Limit||Variable by logarithmic control|
|Safety||Constructed to IEC 348|
|Dimensions||W.170H.155 D.265 Wt.5kg|