Please let me ask, and I know I am probably just being lazy but you have to understand, I am trying to figure some design issues out without spending more money. Does anyone have a circuit schematic for connecting one of the P89C66x to a serial port to alow one to upload a program for the first time. I could try to draw one my self and submit it but that seems like it would just be a waist of time if one already exists. Once again I would like to thank everyone who has relpied so far. You have all been very instarmental to my start in using the 8051.