MosChip MCS9901 Driver Download (Official)

MosChip Drivers

The MCS9901 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 "" is rated (5 out of 5 stars) based on 859 downloads and 4 reviews. Compatibility for this driver update includes PCs running Windows operating systems such as Windows 7. The total disk space used for this update is 1.5 MB.

4 Ratings

Supported Models


High-Speed PCIe Serial Port

PCI-Express Multi-IO Controller

PCIe ECP Parallel Port

PCIe-IO Bridge

PCIe-ISA Communication Port

PCIe-ISA Parallel Port



Supported Operating Systems

Windows 7 (64 bit)

File Name

Additional Notes

PCI and PCI Express Connectivity

Single lane PCI Express (PCIe) based Peripheral Controller

Uploaded By

Dilipkumar (DG Staff Member) on 10-Apr-2010

Driver Contents File List

The following files are found inside the driver download file.

Name Size Date
MCS9901_Win7/MCS9901_Win7_UM_Ver1.0.pdf 845.0 KB 2 Feb 2010
MCS9901_Win7/Win7_32Bit/PCIeMF.inf 8.2 KB 18 Dec 2009
MCS9901_Win7/Win7_32Bit/PCIeNull.inf 1.6 KB 18 Dec 2009
MCS9901_Win7/Win7_32Bit/ 12.1 KB 5 Jan 2010
MCS9901_Win7/Win7_32Bit/PCIePorts.inf 11.8 KB 18 Dec 2009
MCS9901_Win7/Win7_32Bit/PCIeSetup32.exe 262.1 KB 19 Oct 2009
MCS9901_Win7/Win7_32Bit/X86/ISASerial.sys 65.5 KB 5 Jun 2008
MCS9901_Win7/Win7_32Bit/X86/MOSCHIP_PCIeUninst.exe 49.2 KB 19 Oct 2009
MCS9901_Win7/Win7_32Bit/X86/PCIePorts.dll 63.5 KB 30 Jul 2009
MCS9901_Win7/Win7_32Bit/X86/PPorts.sys 81.9 KB 23 Jul 2009
MCS9901_Win7/Win7_32Bit/X86/SPorts.sys 115.7 KB 17 Aug 2009
MCS9901_Win7/Win7_64Bit/AMD64/ISASerial.sys 68.6 KB 5 Jun 2008
MCS9901_Win7/Win7_64Bit/AMD64/MOSCHIP_PCIeUninst.exe 334.8 KB 19 Oct 2009
MCS9901_Win7/Win7_64Bit/AMD64/PCIePorts.dll 77.3 KB 30 Jul 2009
MCS9901_Win7/Win7_64Bit/AMD64/PPorts.sys 95.7 KB 23 Jul 2009
MCS9901_Win7/Win7_64Bit/AMD64/SPorts.sys 122.9 KB 17 Aug 2009
MCS9901_Win7/Win7_64Bit/PCIeMF.inf 8.2 KB 18 Dec 2009
MCS9901_Win7/Win7_64Bit/PCIeNull.inf 1.6 KB 18 Dec 2009
MCS9901_Win7/Win7_64Bit/ 12.2 KB 5 Jan 2010
MCS9901_Win7/Win7_64Bit/PCIePorts.inf 11.8 KB 18 Dec 2009
MCS9901_Win7/Win7_64Bit/PCIeSetup64.exe 359.9 KB 19 Oct 2009

How to Update MCS9901 Device Drivers Quickly & Easily

Step 1 - Download Your Driver

To get the MCS9901 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 MCS9901 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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