Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Win 7 Pro 64 bit slow serial port response times

06 May 2010   #1

Windows 7 Pro
Win 7 Pro 64 bit slow serial port response times

I am testing out windows 7 64 bit and have run into a problem, I have an old 16 bit application which I understand will not run under windows 7 so I created a virtual pc using MS Virtual PC 2007 and Windows XP Pro, the 16 bit application is running OK on the VM on top of win7 but when I try to use the serial port for printing the response time is very slow and cluggie
Has anyone else run into this situation and ideas on root cause or a fix?

My System SpecsSystem Spec
06 May 2010   #2

Microsoft Community Contributor Award Recipient


Hello and welcome to the Seven Forums.

First thing to do is to update to latest Virtual PC, which is designed to work better with Windows 7. Free download here: Windows Virtual PC: Home Page

My System SpecsSystem Spec
21 Jun 2010   #3

Windows 7 32-bit
Similar issue, different setup

I'm not putting this post in to piggyback on your issue, I just thought it might help you find an answer knowing of my experience.

I'm running Windows 7 32 bit with an older 16 bit program that uses a Cognitive Blaster label printer running directly through the serial port with no printer drivers. I was running the exact same setup on this system under Windows XP and all was fine. Since upgrading to Windows 7, my labels are printing horribly slow. I am currently toying with baud rates to see if that helps any. I have two serial printers on two systems now running Windows 7 and they are both printing really slowly.

I'm wondering if your issue has less to do with virtualiztion and more with Windows 7 having poorer serial drivers or something.
My System SpecsSystem Spec


 Win 7 Pro 64 bit slow serial port response times

Thread Tools

Similar help and support threads
Thread Forum
USB Emulation of a Serial Port
I have a Dell Latitude D620 with 2 USB ports and a Serial port. I need one of the USB ports to emulate a serial port. How do I do that?
Hardware & Devices
BSOD using USB serial port
Sometimes during the debugging of a blackbox via RS-232, my PC crashes with a BSOD. The serial port is working at 9600bps 8N1. Following the instructions in i attached here the related zip file....
BSOD Help and Support
PCI Serial Port?H
Hi, I just installed Windows 7 and updated all my drivers. I am missing two drivers, and I don't know what they are: PCI Serial Port PCI Simple Communication Controller What exactly are these? I own a Lenovo X200 Tablet. Any ideas where I can find the drivers for these two things? ...
PCI Serial Port issues
LENOVO 6072BKU ThinkCentre M57 System Serial Number: LKRGBVB Enclosure Type: Desktop Processor a Main Circuit Board b 2.20 gigahertz Intel Core2 Duo 64 kilobyte primary memory cache 2048 kilobyte secondary memory cache 64-bit ready Multi-core (2 total) Not hyper-threaded Board:...
USB serial port help
So im going to try to explain this as well as i can. I am running a windows 7 and I have a radio I would like to program. The main issue is that the program needed to program it is for DOS. So I installed DOS 6.22 On my VMWare virtual machine (VMware Workstation 8.0.0) and ran the program. Now the...
Hardware & Devices

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 07:00.
Twitter Facebook Google+