What is the I2C ? (I hope I have it right, !2C). Is it a wiring thing. Is it addressable serial devices? I am interested in addressable serial devices. I read about Anabug4 in Nuts and Volts mag. They use E3C to address serial devices so that many can be placed on one serial line. Another question: could this work? A pic is used as a serial switch for 9600 baud. It recieves a command to allow a serial transmission to pass through it, or to stop the transmission. Would the delay from the bit twiddling (transferring inputs to an outputs and visa versa) mess up the serial transmission? What I am getting at is using a pic to make serial device into an addressable device. Thanks for any help. John