Thanks I am trying to do some expermints in AFSK transmission and reciving data with 4 of the 567 ic (@$0.49 each it should be fun to try) is the data coming out of the serial port, #2 line, in bianary coded decimal? or am i way off track. I am studing digital electronics and trying to learn as I go. Thanks for your help. 73 KC7JHO ICQ# 3044899 Amature Radio, It's not just for Talking any more!