MosChip MCS9900 Driver Download (Official)

MosChip Drivers

The MCS9900 is a network device manufactured by MosChip. Issues like weak Wi-Fi signal, slow DNS lookup, duplicate IP addresses, slow network and excessive CPU usage can be solved by updating this driver. This version of "" has been downloaded 370 times with a user rating of 5 out of 5 stars, based on 5 reviews. The uploader reports that this update will work successfully on PCs running Windows XP. The total disk space used for this update is 1.6 MB.

5 Ratings

Supported Models





PCIe to High Speed Serial Port

PCIe to IOBridge

PCIe to Multi Mode Parallel Port



Supported Operating Systems

Windows XP, Windows XP (64 bit), Windows 2000

File Name

Versions (11-Aug-2010)

Additional Notes

PCI and PCI Express Connectivity

Single Lane Multifunction PCI express to I/O Controller

Uploaded By

Karthika (DG Staff Member) on 4-Apr-2011

Driver Contents File List

The following files are found inside the driver download file.

Name Size Date
MCS9900_XP/MCS9900_Win_UM_.pdf 758.0 KB 21 Apr 2010
MCS9900_XP/Win32/MOSCHIP_StnUninst.exe 249.9 KB 14 Nov 2009
MCS9900_XP/Win32/StnLang.ini 22.8 KB 14 Jan 2009
MCS9900_XP/Win32/StnMF.inf 7.0 KB 17 Dec 2009
MCS9900_XP/Win32/StnNULL.inf 1.7 KB 17 Dec 2009
MCS9900_XP/Win32/StnPorts.inf 10.7 KB 13 Mar 2010
MCS9900_XP/Win32/StnSetup.exe 266.2 KB 23 Mar 2010
MCS9900_XP/Win32/X86/StnPPort.sys 83.5 KB 17 Dec 2009
MCS9900_XP/Win32/X86/StnPorts.dll 66.6 KB 20 Jan 2009
MCS9900_XP/Win32/X86/StnSPort.sys 118.8 KB 14 Nov 2009
MCS9900_XP/Win32/ 12.6 KB 21 Mar 2010
MCS9900_XP/Win64/AMD64/StnPPort.sys 97.3 KB 17 Dec 2009
MCS9900_XP/Win64/AMD64/StnPorts.dll 81.4 KB 20 Jan 2009
MCS9900_XP/Win64/AMD64/StnSPort.sys 126.5 KB 14 Nov 2009
MCS9900_XP/Win64/MOSCHIP_StnUninst.exe 338.9 KB 14 Nov 2009
MCS9900_XP/Win64/StnLang.ini 22.8 KB 14 Jan 2009
MCS9900_XP/Win64/StnMF.inf 7.0 KB 17 Dec 2009
MCS9900_XP/Win64/StnNULL.inf 1.7 KB 17 Dec 2009
MCS9900_XP/Win64/StnPorts.inf 10.7 KB 12 Mar 2010
MCS9900_XP/Win64/StnSetup.exe 366.6 KB 23 Mar 2010
MCS9900_XP/Win64/ 12.7 KB 21 Mar 2010

How to Update MCS9900 Device Drivers Quickly & Easily

Step 1 - Download Your Driver

To get the MCS9900 driver, click the green download button above. After you complete your download, move on to Step 2.

If the driver listed is not the right version or operating system, search our driver archive for the correct version. Enter MosChip MCS9900 into the search box above and then submit. In the results, choose the best match for your PC and operating system.

Tech Tip: If you are having trouble deciding which is the right driver, try the MosChip Driver Update Utility. It is a software utility which automatically finds and downloads the right driver.

To find the newest driver, you may need to visit the MosChip website. Most major device manufacturers update their drivers regularly.

Step 2 - Install Your Driver

Once you have downloaded your new driver, you'll need to install it. In Windows, use a built-in utility called Device Manager, which allows you to see all of the devices recognized by your system, and the drivers associated with them.

How to Open Device Manager

  • In Windows 11, Windows 10 & Windows 8.1, right-click the Start menu and select Device Manager

  • In Windows 8, swipe up from the bottom, or right-click anywhere on the desktop and choose "All Apps" -> swipe or scroll right and choose "Control Panel" (under Windows System section) -> Hardware and Sound -> Device Manager

  • In Windows 7, click Start -> Control Panel -> Hardware and Sound -> Device Manager

  • In Windows Vista, click Start -> Control Panel -> System and Maintenance -> Device Manager

  • In Windows XP, click Start -> Control Panel -> Performance and Maintenance -> System -> Hardware tab -> Device Manager button

How to Install a driver from Device Manager

  1. Locate the device and model that is having the issue and double-click on it to open the Properties dialog box.

  2. Select the Driver tab.

  3. Click the Update Driver button and follow the instructions.

In most cases, you will need to reboot your computer in order for the driver update to take effect.

Tech Tip: Driver downloads and updates come in a variety of file formats with different file extensions. For example, you may have downloaded an EXE, INF, ZIP, or SYS file. Each file type has a slighty different installation procedure to follow.

For more help, visit our Driver Support Page for step-by-step videos on how to install drivers for every file type.

This website is not affiliated with MosChip. All company names/logos are properties of their owners.
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