MosChip MCS7840 Driver Download (Official)

6 Ratings

Supported Models


High-Speed USB MultiSerial Compound Device

High-Speed USB Serial Port



Supported Operating Systems

Windows XP, Windows 2000, Windows ME, Windows 98

File Name

Versions (31-May-2008) (2008-05-30) via .inf (2007-09-03) via .inf

Uploader Notes

The MCS7840 is a USB 2.0 to Quad-Serial Port device. It has been developed to connect a wide range of standard serial devices to a USB host. The MCS7840 has a USB device controller connected to four (4) individual UARTs.

Uploaded By

Sathishkumar (DG Staff Member) on 14-Aug-2009

Driver Contents File List

The following files are found inside the driver download file.

Name Size Date
Diagnostic Utility_UM.pdf 201.8 KB 5 Oct 2006
Driver_User manual_98ME.pdf 144.3 KB 5 Oct 2006
Driver_User manual_XP.pdf 333.6 KB 5 Oct 2006
Version1.4.1.0/Win32/9710_7840_QUADPORT_MSUninst.exe 258.0 KB 3 Jun 2008
Version1.4.1.0/Win32/MSSetup_QUADPORT.exe 286.7 KB 3 Jun 2008
Version1.4.1.0/Win32/Win98&me/DbgMsg9X.sys 18.5 KB 17 Sep 2004
Version1.4.1.0/Win32/Win98&me/MONITOR.EXE 307.2 KB 17 Sep 2004
Version1.4.1.0/Win32/Win98&me/MOS24SPT.vxd 8.8 KB 20 Oct 2006
Version1.4.1.0/Win32/Win98&me/MS24ENUM.vxd 140.5 KB 20 Oct 2006
Version1.4.1.0/Win32/Win98&me/MSConfig.ini 159 bytes 4 Mar 2003
Version1.4.1.0/Win32/Win98&me/MSInputs.ini 31 bytes 17 Sep 2004
Version1.4.1.0/Win32/Win98&me/MSVCP60.DLL 401.5 KB 17 Sep 2004
Version1.4.1.0/Win32/Win98&me/MULSER.DLL 7.5 KB 20 Oct 2006
Version1.4.1.0/Win32/Win98&me/Mos24SPt.inf 2.9 KB 3 Sep 2007
Version1.4.1.0/Win32/Win98&me/Mos24Sr.sys 133.7 KB 3 Sep 2007
Version1.4.1.0/Win32/Win98&me/MulSer.EXE 290.8 KB 20 Oct 2006
Version1.4.1.0/Win32/Win98&me/MultiMP.exe 254.0 KB 20 Oct 2006
Version1.4.1.0/Win32/Win98&me/dbgmsgcfg.dll 28.7 KB 17 Sep 2004
Version1.4.1.0/Win32/Win98&me/mos24sr.inf 3.7 KB 3 Sep 2007
Version1.4.1.0/Win32/win32/MSConfig_QUADPORT.ini 159 bytes 6 Nov 2006
Version1.4.1.0/Win32/win32/Mos24SerPropPage_QUADPORT.dll 65.5 KB 31 May 2008
Version1.4.1.0/Win32/win32/Mos24Ser_QUADPORT.inf 4.9 KB 31 May 2008
Version1.4.1.0/Win32/win32/Mos24Serial_QUADPORT.exe 303.1 KB 31 May 2008
Version1.4.1.0/Win32/win32/Ms24Comp_QUADPORT.inf 3.3 KB 31 May 2008
Version1.4.1.0/Win32/win32/MultiMP_QUADPORT.exe 249.9 KB 31 May 2008
Version1.4.1.0/Win32/win32/QuadCoInst.dll 9.2 KB 31 May 2008
Version1.4.1.0/Win32/win32/mos24ser_QUADPORT.sys 615.0 KB 31 May 2008

How to Update MCS7840 Device Drivers Quickly & Easily

Step 1 - Download Your Driver

To get the MCS7840 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 MCS7840 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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