Yes that's SO close. it is missing however the input PC. 1 pc to connect to 2 different PC's KEith --- Jinx wrote: > Is this getting close ? > > In this circuit, with Ctrl=0 the PIC can listen to > PC1, as the > pull-up will enable traffic through the top two > gates. If Ctrl=1 > then that will disable traffic from PC1 and enable > it for PC2 > > You could use individual enable controls for each PC > (if you > expand to more than 2 PCs) if you can assure that > all will not > be turned on together and so give data > collisions/mixing > > My assumption was that you were saving costs by > multiplexing > the more expensive MAX chip, hence my query about > voltage > levels > > ATTACHMENT part 2 image/gif name=2xPC.gif __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.