The MCS7840 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. Visitors have downloaded this file "MCS7840_WHQL.zip" 108 times with an aggregate rating of 5 out of 5 stars based on 7 reviews. The uploader reports that this update will work successfully on PCs running Windows Vista and Windows XP. The total disk space used for this update is 2.9 MB.
MCS7840
High-Speed USB MultiSerial Compound Device
High-Speed USB Serial Port
MosChip High-Speed USB MultiSerial Compound Device
MosChip High-Speed USB Serial Port
Windows Vista, Windows Vista (64 bit), Windows XP, Windows XP (64 bit)
MCS7840_WHQL.zip (2.9 MB)
1.0.0.0 (31-May-2008)
1.2.6.0 (2006-10-11) via .inf
1.3.7.0 (2007-04-24) via .inf
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.
Sathishkumar (DG Staff Member) on 14-Aug-2009
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.
After downloading your new driver, installation is the next step. On Windows, utilize the built-in Device Manager utility to manage this process. This tool provides a comprehensive view of all system-recognized devices and their associated drivers. To complete the installation, a system restart is typically required 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.
The following files are found inside the driver download file.
| Name | Size | Date |
|---|---|---|
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL32/9710_7840_MOSCHIP_MSUninst.exe | 262.1 KB | 25 May 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL32/MSSetup.exe | 282.6 KB | 30 May 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL32/Win32/Mos24Ser.inf | 4.5 KB | 16 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL32/Win32/Mos24SerPropPage.dll | 61.4 KB | 16 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL32/Win32/Mos24Serial.exe | 307.2 KB | 16 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL32/Win32/Ms24Comp.inf | 2.3 KB | 16 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL32/Win32/mos24ser.cat | 12.1 KB | 16 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL32/Win32/mos24ser.sys | 570.1 KB | 16 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL64/9710_7840_MOSCHIP_MSUninst.exe | 370.7 KB | 8 Jun 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL64/MSSetup.exe | 400.4 KB | 30 May 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL64/win64_AMD/Mos24Ser.inf | 4.5 KB | 11 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL64/win64_AMD/Mos24SerPropPage.dll | 64.5 KB | 11 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL64/win64_AMD/Mos24Serial.exe | 413.7 KB | 11 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL64/win64_AMD/Ms24Comp.inf | 2.3 KB | 11 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL64/win64_AMD/mos24ser.cat | 12.1 KB | 11 Jul 2007 |
| MCS7840_WHQL/MCS7840_Vista_WHQL/Vista_WHQL64/win64_AMD/mos24ser.sys | 347.8 KB | 11 Jul 2007 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/MSSetup.exe | 274.4 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/MSUninst.exe | 258.0 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/winxp/MSUninst.exe | 258.0 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/winxp/Mos24Ser.inf | 4.9 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/winxp/Mos24SerPropPage.dll | 61.4 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/winxp/Mos24Serial.exe | 299.0 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/winxp/Ms24Comp.inf | 2.6 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/winxp/mos24ser.cat | 9.9 KB | 16 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL32/winxp/mos24ser.sys | 546.6 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/MSSetup.exe | 385.5 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/MSUninst.exe | 362.0 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/win64_AMD/MSUninst.exe | 362.0 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/win64_AMD/Mos24Ser.inf | 4.9 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/win64_AMD/Mos24SerPropPage.dll | 63.0 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/win64_AMD/Mos24Serial.exe | 407.0 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/win64_AMD/Ms24Comp.inf | 2.6 KB | 11 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/win64_AMD/mos24ser.cat | 10.0 KB | 16 Oct 2006 |
| MCS7840_WHQL/MCS7840_XP_WHQL/WHQL64/win64_AMD/mos24ser.sys | 335.5 KB | 11 Oct 2006 |