Writing custom virtual hardware devices

Hi

Is it possible to write custom devices for Parallels Desktop?

In the list of possible devices we have:

* USB
* Hard disk
* CD/DVD
* Network
* Sound
* Serial
* printer

But is it possible to add custom devices?

I try to virtualize a computer with a number of General Purpose I/O (GPIO).

It would be very usefully if it was possible to write some software, that takes care of reading and writing from hardware ports, and generating interrupts on the client interrupt controller.

BR
kvleonhardt