[vbox-dev] LPT Port Using VBox 4.04

Jaka Bac jakabac at gmail.com
Fri Feb 25 14:03:31 PST 2011

Hi Bob

Just a wild guess... Some programs who want to do direct port I/O might need
something like the GiveIO driver, which lets the user mode applications do
these things. I know that there were other similar drivers like this, but
now only this one comes to my mind. I don't know which one VirtualBox wants
to have, but I bet that it wants to do the LPT I/O in user mode and so it
needs something like this in order to get access to the port address

Best Regards,

On 25 February 2011 22:32, Bob McCurdy <bob at ramccurdy.com> wrote:

> I wrote yesterday asking fotr help using the parallel port on a Windows 7
> host from a Windows 2000 guest. I have found quite a bit from searching
> source code, the config file, etc. However, when I set enabled=true in the
> config file VirtualBox comes up with a VERR_PDM_DRIVER_NOT_FOUND error for
> LPT1. It seems evident there is something more that needs to be done to get
> the VM to recognize LPT1 on the host, which, by the way, works fine
> otherwise. If anyone knows what else needs to be done I would really
> appreciate it, at the very least a nudge in the right direction! We are
> under a real time crunch to get this working. We only need to be able to
> send a single character out through the LPT port from time to time, so fancy
> support for more sophisticated printers is the least of our worries. Thanks
> in advance to anyone who can help me with this. If something needs to be
> modified, recompiled, etc., that is okay. I have been writing both low and
> high level software for many years so no real problems there. Thanks again
> for any help.
> Bob McCurdy
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> vbox-dev at virtualbox.org
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