> Cool. How do you handle flow control between the host and the target? Originally it burned each byte as received, but for "field production" purposes I felt it wiser to go with some sort of protocol. The sender doesn't put out the next line until it gets a CR from the PIC. If it gets a bad line, it sends ESC and ignores all lines. The command BURN to the PIC gets the thing to start reading the hex file. Andy ================================================================== Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA ==================================================================