Most modern computers lack a physical DB-25 parallel port. Even if you use a USB-to-Parallel adapter cable, Windows often struggles to map that cable as a virtual LPT1 port for older software.
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You open Task Manager (Ctrl + Shift + Esc), click "More details," and see usbprns2exe sitting at 25%, 50%, or even 100% CPU. Why does this happen? Most modern computers lack a physical DB-25 parallel port