I like this one:
http://www.beyondlogic.org/index.html#PARALLEL
Vasile

On Tue, 31 Jul 2001, Wade Carpenter wrote:

> Hello,
>
> -- Warning --
> -- Stupid question following below =)
>
> Looking for someone with good knowledge of the PC's parallel port, new and
> old computers.
>
> I am trying to interface to the parallel port, and I am having no luck -
> absolutely none.
>
> Here is what I am starting with for knowledge (assumptions?):
>
> 1) Outputs are open collector type.
> 2) Pin configuration of the port.
>
> Now some places (I.e. a certain parallel port FAQ at
> http://www.lvr.com/files/ibmlpt.txt) will tell me that the outputs are TTL.
>
> Here's where I noticed that I'm not able to get it to work properly.  I
> tried to connect the port to a 74LS05 (Inverter) and the output and inputs
> to this chip are something like 1.3V. Total garbage.  Regardless of the
> port's state.  I do believe that the software I'm using to toggle all of the
> outputs on the port is correct.
>
> Any ideas???
>
> Thanks,
>
> Wade
>
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