WindowsXP will not allow software to directly access the parallel ports, which is what is required for WriteLog 
and N1MMLogger to generate cw keying.  A special device driver can be installed to allow parallel port keying 
by these programs under WinXP.  There are two different drivers that can be used, DLPORTIO and USERPORT.  
I prefer DLPORTIO, but in some systems USERPORT seems to work better.  I'll give instructions for both.  

Here's what I did to get DLPORTIO working:

Download dlportio.zip here and expand.

Copy dlportio.sys and dlportio.dll from the \DriverLINX\drivers folder into the \install folder.

Run install.exe

Reboot
 

Here's what I did to get userport.sys working:

Determine the I/O addresses being used by the parallel port that you want WriteLog to key with. 

		right-click "My Computer" - properties
		Hardware - Device Manager
		expand "Ports" - right click desired parallel port - properties - Resources
		write down the first I/O Range listed (378-37F for my LPT1)
		cancel and close
			
Download userport.zip from here or search the Web for another suitable download site

Extract the file and copy userport.sys to the Windows\System32\drivers directory

Run userport.exe and in both columns of the Grant List screen, highlight and remove the address ranges other 
than the one you wrote down in step 1 and then click "start" and "exit"

(there's also more info on parallel port interfacing here)

After installing one of the above drivers, proceed as follows
 
   
   N1MMLogger:

   Go to Config - Configure Ports and check the box for the LPT port you will use and you're finished.

   WriteLog:

   If you are using a version of WriteLog prior to 10.34, rename fport16.exe to "fport16.exe.bak" to disable it.  
   It's in the WriteLog programs directory.  This will prevent WriteLog from overwriting your writelog.ini file with 
   incorrect port addresses.  Newer releases of WriteLog corrected this.
   
   Also, open the writelog.ini file in the Windows folder and if necessary, go to the [PORTS] section and edit 
   the "LPTX=" line for the port you will be using with the correct starting I/O address that you found in step 1.  
   While you're at it, make sure there's an entry line for "CW_ON_PIN1=1" in the [PORTS] section as well.
   
   Go to Setup - Ports and check the LPT port you want to use and you're finished.
 
   

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