LowProfile PCI-Express 2S Serial RS-232 card
This document will present the steps needed to Install / Un-install the drivers of MosChip
PCI to Serial / Printer port products or another manufacturer’s product based on MosChip
In this document, the MCS9835 is taken as an example to explain the installation process.
MCS9835 offers two serial ports and one printer port.
Download the appropriate drivers from the link :
The drivers can be downloaded
from the category “PCI Connectivity” in the download section of our website.
Allow the “.zip” file to be downloaded to your local computer. Unzip the Driver files to a
directory on your PC Hard Disk, or to a Floppy Diskette.
Note : MCS98XX drivers are certified by Microsoft for
Vista 32bit & Vista 64bit operating systems.
Windows V ista i s th e first version of Windows t h at i s
enforcing some restrictions in adding un-signed drivers
to the kernel.
Installing Drivers for the first time:
Switch OFF the PC.
Insert the peripheral card into the computer.
Ensure that there are no external devices connected to the Ports at this time. They can
interfere with the installation of the Drivers.
Turn ON the computer.
Windows should detect the new card, and automatically invoke the “Found New
“Install this driver software anyway” to proceed with driver installation.
Following pop-up screen applies to un-signed drivers only. Hence u will not see
this with Microsoft certified drivers (Signed drivers).
Preparing Vista 64-bit Operating System for installing un-signed drivers:
Steps given below are relevant for using Un-signed drivers on Vista operating system.
MCS98XX drivers are certified by Microsoft (Signed drivers) hence steps below do not
apply when Signed drivers are used.
• Using the F8 option: Press F8 key on your keyboard while booting your PC. You
will get into “Advanced Boot Options”. Select “Disable Driver Signature
• An F8 Advanced Boot Option introduced with Windows Vista—“Disable Driver
Signature Enforcement”—is available to disable the kernel-signing enforcement
only for the current boot session. This setting does not persist across boot sessions.
Note: Make sure to use F8 option every time you boot/reboot your PC before start
working with MCS98XX
• Make sure that the User installing the driver must be a member of the
Administrator group on the system.
You will get a “User Account Control” window saying “An unidentified program
wants access to your computer”. Click on Allow to continue installing the Driver.