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