Modern 64-bit Windows versions do not natively support the 32-bit parallel port drivers required by the Willem software. To make it work, you must follow these steps:
For the board, the most stable and widely compatible software version is Willem EPROM Programmer Software v0.97 or v0.98 (sometimes labeled as Willem 0.97 or Willem 0.98 ). Willem Pcb50b Software Download
Are you trying to run this software on a modern 64-bit version of Windows (like 10 or 11), or an older machine with a native parallel port? Sivava Willem EPROM programmer on Windows 7 64-bit Modern 64-bit Windows versions do not natively support
Sites like minuszerodegrees.net host ISO images of the original software CDs. Sivava Willem EPROM programmer on Windows 7 64-bit
: A long-standing source for Willem manuals and software setups can be found at KeeElectronics.com Essential Setup for Modern Windows (7/10/11)
Here is the essential guide to the software for the Willem PCB50B: