VMware Workstation 5.5Features | Documentation | Knowledge Base | Discussion Forums
Parallel ports are used by a variety of devices, including printers, scanners, dongles and disk drives.
Currently, VMware Workstation provides only partial emulation of PS/2 hardware. Specifically, interrupts requested by a device connected to the physical port are not passed to the virtual machine. Also, the guest operating system cannot use DMA (direct memory access) to move data to or from the port. For this reason, not all devices that attach to the parallel port are guaranteed to work correctly.