StarTech PCI4S550 Driver Download (Official)

7 Ratings

Supported Models

PCI4S550 Driver

Compact Flash OX16CF950 Driver

High Speed Communications Port Driver

OX12PCI840 PCI Parallel port (Windows 2000) Driver

OX12PCI840 PCI Parallel port (Windows 98/ME) Driver

OX12PCI840 PCI Parallel port (Windows XP) Driver

OX16C95x Communications port Driver

OX16PCI952 PCI Parallel port (Windows 2000) Driver



OEM Computers Inc.

Supported Operating Systems

Windows 2003, Windows XP, Windows 2000, Windows NT4, Windows ME, Windows 98SE, Windows 98, Windows 95

File Name


4.0.9 (2004-07-22) via .inf

Uploader Notes

PCI4S550 4-Port Serial PCI I/O Card

I/O Card Driver File

Uploaded By

Alagappan (DG Staff Member) on 7-Mar-2005

Driver Contents File List

The following files are found inside the driver download file.

Name Size Date
oxpar_2k.sys 24.8 KB 26 Jul 2004
Oxserui.dll 22.7 KB 7 Apr 2000
OXPAR.INF 7.8 KB 26 Jul 2004
OXMFUF.SYS 5.0 KB 26 Jul 2004
oxpci2.inf 5.0 KB 26 Jul 2004 10.3 KB 10 Aug 2004
WinNT4/licence.txt 962 bytes 7 Apr 2000
WinNT4/parxport.sys 13.6 KB 16 May 2001
WinNT4/Install_Serial.exe 143.4 KB 7 Apr 2000
WinNT4/Install_Parallel.exe 151.6 KB 18 Oct 2000
WinNT4/OxSer.inf 2.2 KB 15 Nov 2001
WinNT4/oxser.sys 54.6 KB 16 May 2001
WinNT4/PARXPORT.INF 2.4 KB 15 Nov 2001
OXMFCF.vxd 7.7 KB 26 Nov 2001
readme.txt 2.4 KB 26 Jul 2004
oxpci.inf 11.6 KB 26 Jul 2004
oxpar_xp.sys 75.9 KB 7 Nov 2003
OxMF.sys 15.9 KB 26 Jul 2004
OXUI.DLL 94.2 KB 14 Feb 2001
OXSER.INF 7.0 KB 26 Jul 2004
oxppui.dll 9.1 KB 7 Nov 2003 11.5 KB 10 Aug 2004
OXSER.VXD 14.4 KB 20 Nov 2000 9.4 KB 10 Aug 2004 9.4 KB 10 Aug 2004
OxMEP.sys 4.2 KB 26 Jul 2004
oxpar2.inf 2.3 KB 26 Jul 2004
OXPP.vxd 7.8 KB 7 Nov 2003 10.3 KB 10 Aug 2004
OXMF.vxd 7.2 KB 7 Nov 2003
OXSER.SYS 50.0 KB 26 Jul 2004

How to Update PCI4S550 Device Drivers Quickly & Easily

Step 1 - Download Your Driver

To get the PCI4S550 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 StarTech PCI4S550 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 Driver Update Utility for StarTech PCI4S550. It is a software utility which automatically finds and downloads the right driver.

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.

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