Open io.ini and change the default address (0x378) to the base address of your parallel port. Install the Willem EPROM/FLASH Programmer software normally, then copy io.dll, io.ini and inpout32.dll to its installation directory (it should contain the current io.dll). Inpout32.dll was originally from Logix4u, this package contains the updated 64-bit compatible version from HighRez, io.dll is by Fred. I cannot accept any liability for any damages (to your computer, programmer, devices being programmed or any other device) that might occur when using this software. This software is presented as a quick fix to a problem with software that is hard-coded to use legacy port addresses.
The first is the programming software itself, the second is the fix. Letting old software work with 'modern' parallel ports.