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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

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