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Windows 7: Can't access COM or LPT ports in XP Compatibility Mode

13 May 2010   #1

Win 7
Can't access COM or LPT ports in XP Compatibility Mode

I'm running Win 7 64bit on my new computer and I've installed XP Compatibility Mode to run older applicaitons. I've also installed a PCI-bus "COM and LPT card" in the new computer and Win 7 sees it just fine in Device Manager.

The proglem is: I have a Brother P-Touch Label Maker that only works on my old computer running XP. Brother has stopped supporting this label maker and will not write Win 7 drivers. Therefore, I'm trying use the label maker in XP Compatibility Mode on my new computer. The label maker connects to a COM port. However, XP Mode does not see the COM ports (on the PCI card) that exist on my Win 7 computer. I've also tried a P/N US232R-10 USB-to-Serial adapter from FTDI-Chip but XP Mode doesn't see this either.

Also, XP Mode Virtual PC cannot access the LPT port on the PCI card of my Win 7 computer. I need to use the LPT port for connecting an EPROM Programmer.

Is there any way for XP Mode to see the COM and LPT ports on the actual physical computer?
Thanks, Kevin.

My System SpecsSystem Spec
13 May 2010   #2


Sounds like those cards came with your motherboard - any chance of you finding XP drivers for all the peripherals for your motherboard and installing them in the compatibility mode?

Or does compatibility mode not work like that?
My System SpecsSystem Spec
13 May 2010   #3

Win 7
partially working

The PCI bus serial card can't be seen by XP Mode. I've got the "USB serial COM port" working however. Each time you launch the Virtual PC, you must click on a tab that says "USB Connect."
My System SpecsSystem Spec


 Can't access COM or LPT ports in XP Compatibility Mode

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