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How do I change the serial ports to COM1 and COM2 on this adapter when they say busy??

stallings123
stallings123 asked
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Last Modified: 2011-09-20
We have a compaq computer with XP pro.  It did not have any serial ports so we added a card to the machine.  It has picked up COM4 and COM6 indicating that COM1,2,,3,5 are all busy, however, I cannot find what is using them.  I need to make this card COM1 and COM2.  How can I eliminate the busy ones???
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Commented:
I have phantom serial ports in Windows XP. How can I remove them?
http://www.digi.com/support/kbase/kbaseresultdetl.jsp?id=274

good search term online is .....

Remove Phantom Com ports Windows
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Ensure the IO addresses are correct for Com1 (3F8) and Com2 (2F8).

You can also delete all the com ports listed in the device manager. Include the comport 5 & 6. Then force a hardware detection. This may put your ports to com1 & com2

If you can not see any com ports, remember to show non present devices.

   1. Go to Start, right-click My Computer, and select Properties.
   2. In the System Properties dialog box, select the Advanced tab and click the Environment Variables button.
   3. In the Environment Variables dialog box, locate the System Variables panel and click New.
   4. In the New System Variable dialog box, type DEVMGR_SHOW_NONPRESENT_DEVICES in the Variable Name text box and type 1 in the Variable Value text box.
   5. Click OK twice.
   6. To view the non-present devices, go to Start, right-click My Computer, and select Manage.
   7. Click Device Manager, pull down the View menu, and select Show Hidden Devices.

Also check in the BIOS to see if com ports are enabled even if you do not have the connections for them.

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