Subject: 8251 troubles From: dwight elvey <dkelvey at hotmail.com> Date: Sun, 27 Apr 2008 08:23:09 -0700 To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Hi I've got a funny problem with a 8251. I've been writing 8080 code and seem to have a strange problem. I initialize the chip in async mode. I have a light box on the serial wire. It is initialized to both send and recieve. I send one character to the 8251 and it passes it to the software on the 8080 side. I display it on the 8080 side. I then send another character to the 8251. Nothing happens. It won't receive until I reset it. None of the status lights change. I can see the data light flicker. It could be a bad part but it just doesn't seem that it would work once and then fail to work for the second character. It just doesn't make sense. Is there something I'm missing about the 8251. Dwight _________________________________________________________________ Spell a grand slam in this game where word skill meets World Series. Get in the game. http://club.live.com/word_slugger.aspx?icid=word_slugger_wlhm_admod_april08