http://jledger.proboards.com/index.cgi?board=dtvhacking&action=display&thread=2986 I bring it up because I had posted the schematic of a circuite I want to incorporate With my user port to scan 4 "player buttons" for my project.... I had a couple of questions regarding open collect and if I could interface The 8 user port pins with 74LS series chips... I did read that the DTV was TTL 5 volt tolerant... do you guys know if that is directly? Or do I have to Something to outputs of the ttl before sending them to the user 0 to 7 bits... :)