Hmmm.....

Some quick things (you may have already tried):
1) See if you get the same "garbage" results without the '05 attached (i.e. look
directly at your parallel port pins)
2) Tie all unused '05 input pins to GND or VCC (comments?)
3) Use pullups of ~10k on '05 outputs?
4) Check that the parallel port cable that you're using brings all the signals
you want thru, without crossing any over either.  I.e. D0->D0, ACK->ACK etc.

-Dave.

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
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads