[Linux-parport] True Parallel Port Interface for Bit-banging?

[Sebastian Frias]

On 10/29/2016 01:12 AM, Maciej S. Szmigiero wrote:
>> Would you mind sharing the laptop's model?
> 
> This is Elitebook model 8570p.

That seems like a fairly recent laptop:

http://www.notebookcheck.net/Review-HP-EliteBook-8570p-B6Q03EA-ABD-Notebook.82291.0.html

and it has a true parallel port? Thanks a lot for the pointer!

>> There are a bunch of
>> Elitebooks and maybe not all have the ports wired.
>> Does your laptop has the Parallel Port on the docking or on the laptop
>> itself?
> 
> Only a serial port socket is built-it, parallel port socket is
> available only via a port replicator.
> 
> According to description of this replicator it is compatible with
> a lot of different Elitebooks and Probooks:
> http://h30094.www3.hp.com/product.aspx?sku=10432928&mfg_part=A7E34AA&pagemode=ca
> 
> I wasn't able find any note in this replicator description that port
> availability depends on connected laptop model.
> You can try to search for particular laptop model schematics, even
> if it is available only for sale sometimes there is a preview
> page with block diagram which clearly show where the parallel port
> is connected (this is true for my laptop model for example).
> 
> However, whether the port is on standard I/O address and interrupt
> line requires some more digging.

Thanks for the information.

>> Do you know the command to enable them thru PnP? Shouldn't loading
>> the kernel module be enough? Or is it the other way around and 
>> enabling thru PnP triggers the kernel module load process?
> 
> If you want to use them under Linux then everything should be taken
> care of by kernel's PnP support.
> It can be problem if you want to use them under pure DOS.
> 

I see, thanks.